diff --git a/composer.json b/composer.json
index 61f5643..f17024c 100644
--- a/composer.json
+++ b/composer.json
@@ -48,6 +48,7 @@
 		}
 	},
 	"bin": [
+		"php/bin/cachectl.php",
 		"php/bin/dumpser.php",
 		"php/bin/json2yml.php",
 		"php/bin/yml2json.php",
diff --git a/php/bin/cachectl.php b/php/bin/cachectl.php
new file mode 100755
index 0000000..48de2bc
--- /dev/null
+++ b/php/bin/cachectl.php
@@ -0,0 +1,7 @@
+#!/usr/bin/php
+<?php
+require $_composer_autoload_path?? __DIR__.'/../vendor/autoload.php';
+
+use cli\CachectlApp;
+
+CachectlApp::run();
\ No newline at end of file
diff --git a/php/cli/CachectlApp.php b/php/cli/CachectlApp.php
new file mode 100644
index 0000000..2773cee
--- /dev/null
+++ b/php/cli/CachectlApp.php
@@ -0,0 +1,127 @@
+<?php
+namespace cli;
+
+use Exception;
+use nulib\app\cli\Application;
+use nulib\cache\CacheFile;
+use nulib\ext\yaml;
+use nulib\os\path;
+use nulib\output\msg;
+
+class CachectlApp extends Application {
+  const ACTION_READ = 10, ACTION_INFOS = 20, ACTION_CLEAN = 30;
+  const ACTION_UPDATE = 40, ACTION_UPDATE_ADD = 41, ACTION_UPDATE_SUB = 42, ACTION_UPDATE_SET = 43;
+
+  const ARGS = [
+    "merge" => parent::ARGS,
+    "purpose" => "gestion de fichiers cache",
+    ["-r", "--read", "name" => "action", "value" => self::ACTION_READ,
+      "help" => "Afficher le contenu d'un fichier cache",
+    ],
+    ["-i", "--infos", "name" => "action", "value" => self::ACTION_INFOS,
+      "help" => "Afficher des informations sur le fichier cache",
+    ],
+    ["-k", "--clean", "name" => "action", "value" => self::ACTION_CLEAN,
+      "help" => "Supprimer le fichier cache s'il a expiré",
+    ],
+    ["-a", "--add-duration", "args" => 1,
+      "action" => [null, "->setActionUpdate", self::ACTION_UPDATE_ADD],
+      "help" => "Ajouter le nombre de secondes spécifié à la durée du cache",
+    ],
+    ["-b", "--sub-duration", "args" => 1,
+      "action" => [null, "->setActionUpdate", self::ACTION_UPDATE_SUB],
+      "help" => "Enlever le nombre de secondes spécifié à la durée du cache",
+    ],
+    #XXX pas encore implémenté
+    //["-s", "--set-duration", "args" => 1,
+    //  "action" => [null, "->setActionUpdate", self::ACTION_UPDATE_SET],
+    //  "help" => "Mettre à jour la durée du cache à la valeur spécifiée",
+    //],
+  ];
+
+  protected $action = self::ACTION_READ;
+
+  protected $updateAction, $updateDuration;
+
+  function setActionUpdate(int $action, $updateDuration): void {
+    $this->action = self::ACTION_UPDATE;
+    switch ($action) {
+    case self::ACTION_UPDATE_SUB:
+      $this->updateAction = CacheFile::UPDATE_SUB;
+      break;
+    case self::ACTION_UPDATE_SET:
+      $this->updateAction = CacheFile::UPDATE_SET;
+      break;
+    case self::ACTION_UPDATE_ADD:
+      $this->updateAction = CacheFile::UPDATE_ADD;
+      break;
+    }
+    $this->updateDuration = $updateDuration;
+  }
+
+  protected function findCaches(string $dir, ?array &$files): void {
+    foreach (glob("$dir/*") as $file) {
+      if (is_dir($file)) {
+        $this->findCaches($file, $files);
+      } elseif (is_file($file) && fnmatch("*.cache", $file)) {
+        $files[] = $file;
+      }
+    }
+  }
+
+  function main() {
+    $files = [];
+    foreach ($this->args as $arg) {
+      if (is_dir($arg)) {
+        $this->findCaches($arg, $files);
+      } elseif (is_file($arg)) {
+        $files[] = $arg;
+      } else {
+        msg::warning("$arg: fichier introuvable");
+      }
+    }
+    $showSection = count($files) > 1;
+    foreach ($files as $file) {
+      switch ($this->action) {
+      case self::ACTION_READ:
+        if ($showSection) msg::section($file);
+        $cache = new CacheFile($file, null, [
+          "readonly" => true,
+          "duration" => "INF",
+          "override_duration" => true,
+        ]);
+        yaml::dump($cache->get());
+        break;
+      case self::ACTION_INFOS:
+        if ($showSection) msg::section($file);
+        $cache = new CacheFile($file, null, [
+          "readonly" => true,
+        ]);
+        yaml::dump($cache->getInfos());
+        break;
+      case self::ACTION_CLEAN:
+        msg::action(path::ppath($file));
+        $cache = new CacheFile($file);
+        try {
+          if ($cache->deleteExpired()) msg::asuccess("fichier supprimé");
+          else msg::adone("fichier non expiré");
+        } catch (Exception $e) {
+          msg::afailure($e);
+        }
+        break;
+      case self::ACTION_UPDATE:
+        msg::action(path::ppath($file));
+        $cache = new CacheFile($file);
+        try {
+          $cache->updateDuration($this->updateDuration, $this->updateAction);
+          msg::asuccess("fichier mis à jour");
+        } catch (Exception $e) {
+          msg::afailure($e);
+        }
+        break;
+      default:
+        self::die("$this->action: action non implémentée");
+      }
+    }
+  }
+}
diff --git a/php/src/cache/CacheData.php b/php/src/cache/CacheData.php
new file mode 100644
index 0000000..5ce5b83
--- /dev/null
+++ b/php/src/cache/CacheData.php
@@ -0,0 +1,46 @@
+<?php
+namespace nulib\cache;
+
+use nulib\cl;
+use nulib\php\func;
+use Traversable;
+
+/**
+ * Interface CacheData: gestion d'une donnée mise en cache
+ */
+abstract class CacheData {
+  function __construct(?string $name, $compute) {
+    $this->name = $name ?? "";
+    $this->compute = func::withn($compute ?? static::COMPUTE);
+  }
+
+  protected string $name;
+
+  function getName() : string {
+    return $this->name;
+  }
+
+  protected ?func $compute;
+
+  /** calculer la donnée */
+  function compute() {
+    $compute = $this->compute;
+    $data = $compute !== null? $compute->invoke(): null;
+    return $data;
+  }
+
+  /** spécifier le chemin du cache à partir du fichier de base */
+  abstract function setDatafile(?string $basefile): void;
+
+  /** indiquer si le cache existe */
+  abstract function exists(): bool;
+
+  /** charger la donnée depuis le cache */
+  abstract function load();
+
+  /** sauvegarder la donnée dans le cache et la retourner */
+  abstract function save($data);
+
+  /** supprimer le cache */
+  abstract function delete();
+}
diff --git a/php/src/cache/CacheFile.php b/php/src/cache/CacheFile.php
new file mode 100644
index 0000000..f40ed80
--- /dev/null
+++ b/php/src/cache/CacheFile.php
@@ -0,0 +1,360 @@
+<?php
+namespace nulib\cache;
+
+use Exception;
+use nulib\cv;
+use nulib\ext\utils;
+use nulib\file;
+use nulib\file\SharedFile;
+use nulib\os\path;
+use nulib\php\func;
+use nulib\php\time\DateTime;
+use nulib\php\time\Delay;
+use nulib\str;
+use nulib\ValueException;
+
+class CacheFile extends SharedFile {
+  /** @var string|int durée de vie par défaut des données mises en cache  */
+  const DURATION = "1D"; // jusqu'au lendemain
+
+  static function with($data, ?string $file=null): self {
+    if ($data instanceof self) return $data;
+    else return new static($file, $data);
+  }
+
+  protected static function ensure_source($data, ?CacheData &$source, bool $allowArray=true): bool {
+    if ($data === null || $data instanceof CacheData) {
+      $source = $data;
+    } elseif (is_subclass_of($data, CacheData::class)) {
+      $source = new $data();
+    } elseif (func::is_callable($data)) {
+      $source = new DataCacheData(null, $data);
+    } elseif (is_array($data) && $allowArray) {
+      return false;
+    } elseif (is_iterable($data)) {
+      $source = new DataCacheData(null, static function() use ($data) {
+        yield from $data;
+      });
+    } else {
+      throw ValueException::invalid_type($source, CacheData::class);
+    }
+    return true;
+  }
+
+  function __construct(?string $file, $data=null, ?array $params=null) {
+    $file ??= path::join(sys_get_temp_dir(), utils::uuidgen());
+    $file = path::ensure_ext($file, cache::EXT);
+    $basefile = str::without_suffix(cache::EXT, $file);
+
+    $this->initialDuration = Delay::with($params["duration"] ?? static::DURATION);
+    $this->overrideDuration = $params["override_duration"] ?? false;
+    $this->readonly = $params["readonly"] ?? false;
+    $this->cacheNull = $params["cache_null"] ?? false;
+    $data ??= $params["data"] ?? null;
+    $this->sources = null;
+    if (self::ensure_source($data, $source)) {
+      if ($source !== null) $source->setDatafile($basefile);
+      $this->sources = ["" => $source];
+    } else {
+      $sources = [];
+      $index = 0;
+      foreach ($data as $key => $source) {
+        self::ensure_source($source, $source, false);
+        if ($source !== null) {
+          $source->setDatafile($basefile);
+          if ($key === $index) {
+            $index++;
+            $key = $source->getName();
+          }
+        } elseif ($key === $index) {
+          $index++;
+        }
+        $sources[$key] = $source;
+      }
+      $this->sources = $sources;
+    }
+    parent::__construct($file);
+  }
+
+  protected Delay $initialDuration;
+
+  protected bool $overrideDuration;
+
+  protected bool $readonly;
+
+  protected bool $cacheNull;
+
+  /** @var ?CacheData[] */
+  protected ?array $sources;
+
+  /**
+   * vérifier si le fichier est valide. s'il est invalide, il faut le recréer.
+   *
+   * on assume que le fichier existe, vu qu'il a été ouvert en c+b
+   */
+  function isValid(): bool {
+    # considèrer que le fichier est invalide s'il est de taille nulle
+    return $this->getSize() > 0;
+  }
+
+  protected ?DateTime $start;
+
+  protected ?Delay $duration;
+
+  protected $data;
+
+  /** charger les données. le fichier a déjà été verrouillé en lecture */
+  protected function loadMetadata(): void {
+    if ($this->isValid()) {
+      $this->rewind();
+      [
+        "start" => $start,
+        "duration" => $duration,
+        "data" => $data,
+      ] = $this->unserialize(null, false, true);
+      if ($this->overrideDuration) {
+        $duration = Delay::with($this->initialDuration, $start);
+      }
+    } else {
+      $start = null;
+      $duration = null;
+      $data = null;
+    }
+    $this->start = $start;
+    $this->duration = $duration;
+    $this->data = $data;
+  }
+
+  /**
+   * tester s'il faut mettre les données à jour. le fichier a déjà été
+   * verrouillé en lecture
+   */
+  protected function shouldUpdate(bool $noCache=false): bool {
+    if ($this->isValid()) {
+      $expired = $this->duration->isElapsed();
+    } else {
+      $expired = false;
+      $noCache = true;
+    }
+    return $noCache || $expired;
+  }
+
+  /** sauvegarder les données. le fichier a déjà été verrouillé en écriture */
+  protected function saveMetadata(): void {
+    $this->duration ??= $this->initialDuration;
+    if ($this->start === null) {
+      $this->start = new DateTime();
+      $this->duration = Delay::with($this->duration, $this->start);
+    }
+    $this->ftruncate();
+    $this->serialize([
+      "start" => $this->start,
+      "duration" => $this->duration,
+      "data" => $this->data,
+    ], false, true);
+  }
+
+  protected function unlinkFiles(bool $datafilesOnly=false): void {
+    foreach ($this->sources as $source) {
+      if ($source !== null) $source->delete();
+    }
+    if (!$datafilesOnly) @unlink($this->file);
+  }
+
+  /** tester si $value peut être mis en cache */
+  protected function shouldCache($value): bool {
+    return $this->cacheNull || $value !== null;
+  }
+
+  protected ?DateTime $ostart;
+
+  protected ?Delay $oduration;
+
+  protected $odata;
+
+  protected function beforeAction() {
+    $this->loadMetadata();
+    $this->ostart = cv::clone($this->start);
+    $this->oduration = cv::clone($this->duration);
+    $this->odata = cv::clone($this->data);
+  }
+
+  protected function afterAction() {
+    $modified = false;
+    if ($this->start != $this->ostart) $modified = true;
+    $duration = $this->duration;
+    $oduration = $this->oduration;
+    if ($duration === null || $oduration === null) $modified = true;
+    elseif ($duration->getDest() != $oduration->getDest()) $modified = true;
+    # égalité stricte uniquement pour $data et $datafiles
+    if ($this->data !== $this->odata) $modified = true;
+    if ($modified && !$this->readonly) {
+      $this->lockWrite();
+      $this->saveMetadata();
+    }
+  }
+
+  protected function action(callable $callback, bool $willWrite=false) {
+    if ($willWrite && !$this->readonly) $this->lockWrite();
+    else $this->lockRead();
+    try {
+      $this->beforeAction();
+      $result = $callback();
+      $this->afterAction();
+      return $result;
+    } finally {
+      $this->ostart = null;
+      $this->oduration = null;
+      $this->odata = null;
+      $this->start = null;
+      $this->duration = null;
+      $this->data = null;
+      $this->unlock(true);
+    }
+  }
+
+  protected function compute() {
+    return null;
+  }
+
+  protected function refreshData($data, bool $noCache) {
+    $source = $this->sources[$data] ?? null;
+    $updateMetadata = $this->shouldUpdate($noCache);
+    if ($source === null) $updateData = $this->data === null;
+    else $updateData = !$source->exists();
+    if (!$this->readonly && ($updateMetadata || $updateData)) {
+      $this->lockWrite();
+      if ($updateMetadata) {
+        # il faut refaire tout le cache
+        $this->unlinkFiles(true);
+        $this->start = null;
+        $this->duration = null;
+        $this->data = null;
+        $updateData = true;
+      }
+      if ($source === null) {
+        if ($updateData) {
+          # calculer la valeur
+          try {
+            $data = $this->compute();
+          } catch (Exception $e) {
+            # le fichier n'est pas mis à jour, mais ce n'est pas gênant: lors
+            # des futurs appels, l'exception continuera d'être lancée ou la
+            # valeur sera finalement mise à jour
+            throw $e;
+          }
+        } else {
+          $data = $this->data;
+        }
+        if ($this->shouldCache($data)) $this->data = $data;
+        else $this->data = $data = null;
+      } else {
+        if ($updateData) {
+          # calculer la valeur
+          try {
+            $data = $source->compute();
+          } catch (Exception $e) {
+            # le fichier n'est pas mis à jour, mais ce n'est pas gênant: lors
+            # des futurs appels, l'exception continuera d'être lancée ou la
+            # valeur sera finalement mise à jour
+            throw $e;
+          }
+        } else {
+          $data = $source->load();
+        }
+        if ($this->shouldCache($data)) {
+          $data = $source->save($data);
+        } else {
+          # ne pas garder le fichier s'il ne faut pas mettre en cache
+          $source->delete();
+          $data = null;
+        }
+      }
+    } elseif ($source === null) {
+      $data = $this->data;
+    } elseif ($source->exists()) {
+      $data = $source->load();
+    } else {
+      $data = null;
+    }
+    return $data;
+  }
+
+  /**
+   * s'assurer que le cache est à jour avec les données les plus récentes. si
+   * les données sont déjà présentes dans le cache et n'ont pas encore expirées
+   * cette méthode est un NOP
+   */
+  function refresh(bool $noCache=false): self {
+    $this->action(function() use ($noCache) {
+      foreach (array_keys($this->sources) as $data) {
+        $this->refreshData($data, $noCache);
+      }
+    });
+    return $this;
+  }
+
+  function get($data=null, bool $noCache=false) {
+    return $this->action(function () use ($data, $noCache) {
+      return $this->refreshData($data, $noCache);
+    });
+  }
+
+  function all($data=null, bool $noCache=false): ?iterable {
+    $data = $this->get($data, $noCache);
+    if ($data !== null && !is_iterable($data)) $data = [$data];
+    return $data;
+  }
+
+  function delete($data=null): void {
+    $source = $this->sources[$data] ?? null;
+    if ($source !== null) $source->delete();
+  }
+
+  /** obtenir les informations sur le fichier */
+  function getInfos(): array {
+    return $this->action(function () {
+      if (!$this->isValid()) {
+        return ["valid" => false];
+      }
+      $start = $this->start;
+      $duration = $this->duration;
+      return [
+        "valid" => true,
+        "start" => $start,
+        "duration" => strval($duration),
+        "date_start" => $start->format(),
+        "date_end" => $duration->getDest()->format(),
+      ];
+    });
+  }
+
+  const UPDATE_SUB = -1, UPDATE_SET = 0, UPDATE_ADD = 1;
+
+  /**
+   * mettre à jour la durée de validité du fichier
+   *
+   * XXX UPDATE_SET n'est pas implémenté
+   */
+  function updateDuration($nduration, int $action=self::UPDATE_ADD): void {
+    if ($this->readonly) return;
+    $this->action(function () use ($nduration, $action) {
+      if (!$this->isValid()) return;
+      $duration = $this->duration;
+      if ($action < 0) $duration->subDuration($nduration);
+      elseif ($action > 0) $duration->addDuration($nduration);
+    }, true);
+  }
+
+  /** supprimer les fichiers s'ils ont expiré */
+  function deleteExpired(bool $force=false): bool {
+    if ($this->readonly) return false;
+    return $this->action(function () use ($force) {
+      if ($force || $this->shouldUpdate()) {
+        $this->unlinkFiles();
+        return true;
+      }
+      return false;
+    }, true);
+  }
+}
diff --git a/php/src/cache/CacheManager.php b/php/src/cache/CacheManager.php
new file mode 100644
index 0000000..2b134c9
--- /dev/null
+++ b/php/src/cache/CacheManager.php
@@ -0,0 +1,68 @@
+<?php
+namespace nulib\cache;
+
+use nulib\cl;
+
+/**
+ * Class CacheManager: un gestionnaire de cache permettant de désactiver la mise
+ * en cache d'une valeur dans le cadre d'une session.
+ *
+ * en effet, si on désactive le cache, il doit être réactivé après que la valeur
+ * est calculée, pour éviter qu'une valeur soit calculée encore et encore dans
+ * une session de travail
+ */
+class CacheManager {
+  function __construct(?array $includes=null, ?array $excludes=null) {
+    $this->shouldCaches = [];
+    $this->defaultCache = true;
+    $this->includes = $includes;
+    $this->excludes = $excludes;
+  }
+
+  /**
+   * @var array tableau {id => shouldCache} indiquant si l'élément id doit être
+   * mis en cache
+   */
+  protected array $shouldCaches;
+
+  /**
+   * @var bool valeur par défaut de shouldCache si la valeur n'est pas trouvée
+   * dans $shouldCache
+   */
+  protected bool $defaultCache;
+
+  /**
+   * @var array|null groupes à toujours inclure dans le cache. pour les
+   * identifiants de ces groupe, {@link self::shouldCache()} retourne toujours
+   * true.
+   *
+   * $excludes est prioritaire par rapport à $includes
+   */
+  protected ?array $includes;
+
+  /**
+   * @var array|null groupes à exclure de la mise en cache. la mise en cache est
+   * toujours calculée pour les identifiants de ces groupes.
+   */
+  protected ?array $excludes;
+
+  function setNoCache(bool $noCache=true, bool $reset=true): self {
+    if ($reset) $this->shouldCaches = [];
+    $this->defaultCache = !$noCache;
+    return $this;
+  }
+
+  function shouldCache(string $id, ?string $groupId=null, bool $reset=true): bool {
+    if ($groupId !== null) {
+      $includes = $this->includes;
+      $shouldInclude = $includes !== null && in_array($groupId, $includes);
+      $excludes = $this->excludes;
+      $shouldExclude = $excludes !== null && in_array($groupId, $excludes);
+      if ($shouldInclude && !$shouldExclude) return true;
+    }
+    $cacheId = "$groupId-$id";
+    $shouldCache = cl::get($this->shouldCaches, $cacheId, $this->defaultCache);
+    $this->shouldCaches[$cacheId] = $reset?: $shouldCache;
+    return $shouldCache;
+  }
+}
diff --git a/php/src/cache/CursorCacheData.php b/php/src/cache/CursorCacheData.php
new file mode 100644
index 0000000..bcfdd33
--- /dev/null
+++ b/php/src/cache/CursorCacheData.php
@@ -0,0 +1,36 @@
+<?php
+namespace nulib\cache;
+
+class CursorCacheData extends CacheData {
+  function __construct(array $cursorId, $compute=null, ?CursorChannel $channel=null) {
+    $name = $cursorId["group_id"];
+    if ($name) $name .= "_";
+    $name .= $cursorId["id"];
+    parent::__construct($name, $compute);
+    $channel ??= (new CursorChannel($cursorId))->initStorage(cache::storage());
+    $this->channel = $channel;
+  }
+
+  function setDatafile(?string $basefile): void {
+  }
+
+  protected CursorChannel $channel;
+
+  function exists(): bool {
+    return $this->channel->count() > 0;
+  }
+
+  function load() {
+    return $this->channel;
+  }
+
+  function save($data) {
+    if (!is_iterable($data)) $data = [$data];
+    $this->channel->rechargeAll($data);
+    return $this->channel;
+  }
+
+  function delete() {
+    $this->channel->delete(null);
+  }
+}
diff --git a/php/src/cache/CursorChannel.php b/php/src/cache/CursorChannel.php
new file mode 100644
index 0000000..1af52b1
--- /dev/null
+++ b/php/src/cache/CursorChannel.php
@@ -0,0 +1,127 @@
+<?php
+namespace nulib\cache;
+
+use IteratorAggregate;
+use nulib\cl;
+use nulib\db\CapacitorChannel;
+use nulib\db\CapacitorStorage;
+use nulib\php\func;
+use Traversable;
+
+class CursorChannel extends CapacitorChannel implements IteratorAggregate {
+  static function with($cursorId=null, ?iterable $rows=null, ?CapacitorStorage $storage=null): self {
+    $storage ??= cache::storage();
+    $channel = (new static($cursorId))->initStorage($storage);
+    if ($rows !== null) $channel->rechargeAll($rows);
+    return $channel;
+  }
+
+  const NAME = "cursor";
+  const TABLE_NAME = "cursor";
+
+  const COLUMN_DEFINITIONS = [
+    "group_id_" => "varchar(32) not null", // groupe de curseur
+    "id_" => "varchar(128) not null", // nom du curseur
+    "key_index_" => "integer not null",
+    "key_" => "varchar(128) not null",
+    "search_" => "varchar(255)",
+
+    "primary key (group_id_, id_, key_index_)",
+  ];
+
+  const ADD_COLUMNS = null;
+
+  protected function COLUMN_DEFINITIONS(): ?array {
+    return cl::merge(self::COLUMN_DEFINITIONS, static::ADD_COLUMNS);
+  }
+
+  /**
+   * @param array|string $cursorId
+   */
+  function __construct($cursorId) {
+    parent::__construct();
+    cache::verifix_id($cursorId);
+    [
+      "group_id" => $this->groupId,
+      "id" => $this->id,
+    ] = $cursorId;
+  }
+
+  protected string $groupId;
+
+  protected string $id;
+
+  function getCursorId(): array {
+    return [
+      "group_id" => $this->groupId,
+      "id" => $this->id,
+    ];
+  }
+
+  function getBaseFilter(): ?array {
+    return [
+      "group_id_" => $this->groupId,
+      "id_" => $this->id,
+    ];
+  }
+
+  protected int $index = 0;
+
+  protected function getSearch($item): ?string {
+    $search = cl::filter_n(cl::with($item));
+    $search = implode(" ", $search);
+    return substr($search, 0, 255);
+  }
+
+  function getItemValues($item, $key=null): ?array {
+    $index = $this->index++;
+    $key = $key ?? $index;
+    $key = substr(strval($key), 0, 128);
+    $addColumns = static::ADD_COLUMNS ?? [];
+    $addColumns = cl::select($item,
+      array_filter(array_keys($addColumns), function ($key) {
+        return is_string($key);
+      }));
+    return cl::merge($addColumns, [
+      "group_id_" => $this->groupId,
+      "id_" => $this->id,
+      "key_index_" => $index,
+      "key_" => $key,
+      "search_" => $this->getSearch($item),
+    ]);
+  }
+
+  function reset(bool $recreate=false): void {
+    $this->index = 0;
+    parent::reset($recreate);
+  }
+
+  function chargeAll(?iterable $items, $func=null, ?array $args=null): int {
+    if ($items === null) return 0;
+    $count = 0;
+    if ($func !== null) $func = func::with($func, $args)->bind($this);
+    foreach ($items as $key => $item) {
+      $count += $this->charge($item, $func, [$key]);
+    }
+    return $count;
+  }
+
+  function rechargeAll(?iterable $items): self {
+    $this->delete(null);
+    $this->index = 0;
+    $this->chargeAll($items);
+    return $this;
+  }
+
+  function getIterator(): Traversable {
+    $rows = $this->dbAll([
+      "cols" => ["key_", "item__"],
+      "where" => $this->getBaseFilter(),
+    ]);
+    foreach ($rows as $row) {
+      $key = $row["key_"];
+      $item = $this->unserialize($row["item__"]);
+      yield $key => $item;
+    }
+  }
+}
diff --git a/php/src/cache/DataCacheData.php b/php/src/cache/DataCacheData.php
new file mode 100644
index 0000000..7ada552
--- /dev/null
+++ b/php/src/cache/DataCacheData.php
@@ -0,0 +1,59 @@
+<?php
+namespace nulib\cache;
+
+use nulib\cl;
+use nulib\file;
+use nulib\os\path;
+use nulib\php\func;
+use Traversable;
+
+class DataCacheData extends CacheData {
+  /** @var string identifiant de cette donnée */
+  const NAME = null;
+
+  /** @var callable une fonction permettant de calculer la donnée */
+  const COMPUTE = null;
+
+  function __construct(?string $name=null, $compute=null, ?string $basefile=null) {
+    $name ??= static::NAME ?? "";
+    $compute ??= static::COMPUTE;
+    parent::__construct($name, $compute);
+    $this->setDatafile($basefile);
+  }
+
+  function compute() {
+    $data = parent::compute();
+    if ($data instanceof Traversable) $data = cl::all($data);
+    return $data;
+  }
+
+  protected string $datafile;
+
+  function setDatafile(?string $basefile): void {
+    if ($basefile === null) {
+      $basedir = ".";
+      $basename = "";
+    } else {
+      $basedir = path::dirname($basefile);
+      $basename = path::filename($basefile);
+    }
+    $this->datafile = "$basedir/.$basename.{$this->name}".cache::EXT;
+  }
+
+  function exists(): bool {
+    return file_exists($this->datafile);
+  }
+
+  function load() {
+    return file::reader($this->datafile)->unserialize();
+  }
+
+  function save($data) {
+    file::writer($this->datafile)->serialize($data);
+    return $data;
+  }
+
+  function delete(): void {
+    @unlink($this->datafile);
+  }
+}
diff --git a/php/src/cache/TODO.md b/php/src/cache/TODO.md
new file mode 100644
index 0000000..e8c41c0
--- /dev/null
+++ b/php/src/cache/TODO.md
@@ -0,0 +1,6 @@
+# nulib\cache
+
+* [ ] CacheChannel: stocker aussi la clé primaire, ce qui permet de récupérer
+  la donnée correspondante dans la source?
+
+-*- coding: utf-8 mode: markdown -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8:noeol:binary
\ No newline at end of file
diff --git a/php/src/cache/cache.php b/php/src/cache/cache.php
new file mode 100644
index 0000000..ed599fa
--- /dev/null
+++ b/php/src/cache/cache.php
@@ -0,0 +1,93 @@
+<?php
+namespace nulib\cache;
+
+use nulib\app\app;
+use nulib\db\CapacitorStorage;
+use nulib\db\sqlite\SqliteStorage;
+use nulib\ext\utils;
+
+class cache {
+  /** @var string extension des fichiers de cache */
+  const EXT = ".cache";
+
+  protected static ?string $dbfile = null;
+
+  protected static function dbfile(): ?string {
+    return self::$dbfile ??= app::get()->getVarfile("cache.db");
+  }
+
+  protected static ?CapacitorStorage $storage = null;
+
+  static function storage(): CapacitorStorage {
+    return self::$storage ??= new SqliteStorage(self::dbfile());
+  }
+
+  static function set_storage(CapacitorStorage $storage): CapacitorStorage {
+    return self::$storage = $storage;
+  }
+
+  protected static ?CacheManager $manager = null;
+
+  static function manager(): CacheManager {
+    return self::$manager ??= new CacheManager();
+  }
+
+  static function set_manager(CacheManager $manager): CacheManager {
+    return self::$manager = $manager;
+  }
+
+  static function nc(bool $noCache=true, bool $reset=false): void {
+    self::manager()->setNoCache($noCache, $reset);
+  }
+
+  protected static function should_cache(string $id, ?string $groupId=null, bool $reset=true): bool {
+    return self::manager()->shouldCache($id, $groupId, $reset);
+  }
+
+  static function verifix_id(&$cacheId): void {
+    $cacheId ??= utils::uuidgen();
+    if (is_array($cacheId)) {
+      $keys = array_keys($cacheId);
+      if (array_key_exists("id", $cacheId)) $idKey = "id";
+      else $idKey = $keys[0] ?? null;
+      $id = strval($cacheId[$idKey] ?? "");
+      if (array_key_exists("group_id", $cacheId)) $groupIdKey = "group_id";
+      else $groupIdKey = $keys[1] ?? null;
+      $groupId = strval($cacheId[$groupIdKey] ?? "");
+    } else {
+      $id = strval($cacheId);
+      $groupId = "";
+    }
+    # si le groupe ou le nom sont trop grand, en faire un hash
+    if (strlen($groupId) > 32) $groupId = md5($groupId);
+    if (strlen($id) > 128) $id = substr($id, 0, 128 - 32).md5($id);
+    $cacheId = ["group_id" => $groupId, "id" => $id];
+  }
+
+  private static function new(array $cacheId, ?string $suffix, $data, ?array $params=null): CacheFile {
+    $file = $cacheId["group_id"];
+    if ($file) $file .= "_";
+    $file .= $cacheId["id"];
+    $file .= $suffix;
+    return new CacheFile($file, $data, $params);
+  }
+
+  static function cache($dataId, $data, ?array $params=null): CacheFile {
+    self::verifix_id($dataId);
+    return self::new($dataId, null, $data, $params);
+  }
+
+  static function get($dataId, $data, ?array $params=null) {
+    self::verifix_id($dataId);
+    $noCache = !self::should_cache($dataId["id"], $dataId["group_id"]);
+    $cache = self::new($dataId, null, $data, $params);
+    return $cache->get(null, $noCache);
+  }
+
+  static function all($cursorId, $rows, ?array $params=null): ?iterable {
+    self::verifix_id($cursorId);
+    $noCache = !self::should_cache($cursorId["id"], $cursorId["group_id"]);
+    $cache = self::new($cursorId, "_rows", new CursorCacheData($cursorId, $rows), $params);
+    return $cache->get(null, $noCache);
+  }
+}
diff --git a/php/tbin/.gitignore b/php/tbin/.gitignore
index f3b938a..c44eb09 100644
--- a/php/tbin/.gitignore
+++ b/php/tbin/.gitignore
@@ -1 +1,2 @@
 /*.db
+/*.cache
diff --git a/php/tbin/test-cache.php b/php/tbin/test-cache.php
new file mode 100755
index 0000000..f3590c0
--- /dev/null
+++ b/php/tbin/test-cache.php
@@ -0,0 +1,73 @@
+#!/usr/bin/php
+<?php
+require __DIR__.'/../vendor/autoload.php';
+
+use nulib\cache\DataCacheData;
+use nulib\cache\CacheFile;
+use nulib\ext\yaml;
+use nulib\os\sh;
+
+function show(string $prefix, CacheFile $cache, bool $dumpInfos=true): void {
+  Txx("$prefix=", $cache->get());
+  if ($dumpInfos) {
+    yaml::dump($cache->getInfos());
+  }
+}
+
+//system("rm -f *.cache .*.cache");
+
+$what = [
+  "null",
+  "one",
+  "two",
+  "three",
+];
+$duration = 10;
+
+if (in_array("null", $what)) {
+  $null = new CacheFile("null", null, [
+    "duration" => $duration,
+  ]);
+  show("null", $null);
+}
+
+if (in_array("one", $what)) {
+  $one = new class("one", null, [
+    "duration" => $duration,
+  ]) extends CacheFile {
+    protected function compute() {
+      return 1;
+    }
+  };
+  show("one", $one);
+}
+
+if (in_array("two", $what)) {
+  $two = new CacheFile("two", new DataCacheData(null, function () {
+    return 2;
+  }), [
+    "duration" => $duration,
+  ]);
+  show("two", $two);
+}
+
+if (in_array("three", $what)) {
+  $data31 = new DataCacheData("data31name", function () {
+    return 31;
+  });
+
+  $data32 = new DataCacheData(null, function () {
+    return 32;
+  });
+
+  $three = new CacheFile("three", [
+    "data31" => $data31,
+    $data31, # name=data31name
+    "data32" => $data32,
+    $data32, # name=""
+  ]);
+  Txx("three.0=", $three->get("data31"));
+  Txx("three.1=", $three->get("data31name"));
+  Txx("three.2=", $three->get("data32"));
+  Txx("three.3=", $three->get(""));
+}
diff --git a/php/tests/cache/CursorChannelTest.php b/php/tests/cache/CursorChannelTest.php
new file mode 100644
index 0000000..70e7343
--- /dev/null
+++ b/php/tests/cache/CursorChannelTest.php
@@ -0,0 +1,38 @@
+<?php
+namespace nulib\cache;
+
+use nulib\output\msg;
+
+class CursorChannelTest extends _TestCase {
+  const DATA = [
+    "fr" => ["a" => "un", "b" => "deux"],
+    "eng" => ["a" => "one", "b" => "two"],
+    ["a" => 1, "b" => 2],
+  ];
+
+  function testUsage() {
+    $channel = CursorChannel::with("numbers", self::DATA, self::$storage);
+    $count = 0;
+    foreach ($channel as $key => $item) {
+      msg::info("one: $key => {$item["a"]}");
+      $count++;
+    }
+    self::assertSame(3, $count);
+  }
+
+  function testAddColumns() {
+    $channel = (new class("numbers") extends CursorChannel {
+      const NAME = "numbersac";
+      const TABLE_NAME = self::NAME;
+      const ADD_COLUMNS = [
+        "a" => "varchar(30)",
+      ];
+    })->initStorage(self::$storage)->rechargeAll(self::DATA);
+    $count = 0;
+    foreach ($channel as $key => $item) {
+      msg::info("one: $key => {$item["a"]}");
+      $count++;
+    }
+    self::assertSame(3, $count);
+  }
+}
diff --git a/php/tests/cache/SourceDb.php b/php/tests/cache/SourceDb.php
new file mode 100644
index 0000000..31dc119
--- /dev/null
+++ b/php/tests/cache/SourceDb.php
@@ -0,0 +1,22 @@
+<?php
+namespace nulib\cache;
+
+use nulib\db\sqlite\Sqlite;
+
+class SourceDb extends Sqlite {
+  const MIGRATION = [
+    "create table source (pk integer primary key autoincrement, s varchar(255), i integer, b boolean)",
+    [self::class, "fill_data"],
+  ];
+
+  static function fill_data(Sqlite $db): void {
+    $db->exec("insert into source (s, i, b) values (null, null, null)");
+    $db->exec("insert into source (s, i, b) values ('false', 0, 0)");
+    $db->exec("insert into source (s, i, b) values ('first', 1, 1)");
+    $db->exec("insert into source (s, i, b) values ('second', 2, 1)");
+  }
+
+  public function __construct() {
+    parent::__construct(__DIR__."/source.db");
+  }
+}
diff --git a/php/tests/cache/_TestCase.php b/php/tests/cache/_TestCase.php
new file mode 100644
index 0000000..f05875c
--- /dev/null
+++ b/php/tests/cache/_TestCase.php
@@ -0,0 +1,23 @@
+<?php
+namespace nulib\cache;
+
+use nulib\db\sqlite\SqliteStorage;
+use nulib\output\msg;
+use nulib\output\std\StdMessenger;
+use nulib\tests\TestCase;
+
+class _TestCase extends TestCase {
+  protected static SqliteStorage $storage;
+
+  static function setUpBeforeClass(): void {
+    parent::setUpBeforeClass();
+    msg::set_messenger_class(StdMessenger::class);
+    self::$storage = new SqliteStorage(__DIR__."/cache.db");
+    cache::set_storage(self::$storage);
+  }
+
+  static function tearDownAfterClass(): void {
+    parent::tearDownAfterClass();
+    self::$storage->close();
+  }
+}
diff --git a/php/tests/cache/cacheTest.php b/php/tests/cache/cacheTest.php
new file mode 100644
index 0000000..3a16cb0
--- /dev/null
+++ b/php/tests/cache/cacheTest.php
@@ -0,0 +1,108 @@
+<?php
+namespace nulib\cache;
+
+use nulib\cl;
+use nulib\output\msg;
+
+class cacheTest extends _TestCase {
+  const DATA = [
+    "fr" => ["a" => "un", "b" => "deux"],
+    "eng" => ["a" => "one", "b" => "two"],
+    ["a" => 1, "b" => 2],
+  ];
+
+  function gendata() {
+    msg::note("gendata");
+    foreach (self::DATA as $key => $item) {
+      msg::info("yield $key");
+      yield $key => $item;
+      sleep(2);
+    }
+    msg::note("fin gendata");
+  }
+
+  function _testRows(iterable $rows, int $expectedCount) {
+    $count = 0;
+    foreach ($rows as $key => $row) {
+      $parts = ["got $key => {"];
+      $i = 0;
+      foreach ($row as $k => $v) {
+        if ($i++ > 0) $parts[] = ", ";
+        $parts[] = "$k=$v";
+      }
+      $parts[] = "}";
+      msg::info(implode("", $parts));
+      $count++;
+    }
+    self::assertSame($expectedCount, $count);
+  }
+  
+  function _testGet(string $dataId, int $expectedCount, callable $gencompute) {
+    msg::section($dataId);
+    cache::nc(true, true);
+
+    msg::step("premier");
+    $rows = cache::get($dataId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+    msg::step("deuxième");
+    $rows = cache::get($dataId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+
+    msg::step("vider le cache");
+    cache::nc(true, true);
+
+    msg::step("premier");
+    $rows = cache::get($dataId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+    msg::step("deuxième");
+    $rows = cache::get($dataId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+  }
+
+  function testGetStatic() {
+    $this->_testGet("getStatic", 3, function () {
+      return static function () {
+        msg::note("getdata");
+        return self::DATA;
+      };
+    });
+  }
+
+  function testGetGenerator() {
+    $this->_testGet("getGenerator", 3, function () {
+      return $this->gendata();
+    });
+  }
+
+  function _testAll(string $cursorId, int $expectedCount, callable $gencompute) {
+    msg::section($cursorId);
+    cache::nc(true, true);
+
+    msg::step("premier");
+    $rows = cache::all($cursorId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+    msg::step("deuxième");
+    $rows = cache::all($cursorId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+
+    msg::step("vider le cache");
+    cache::nc(true, true);
+
+    msg::step("premier");
+    $rows = cache::all($cursorId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+    msg::step("deuxième");
+    $rows = cache::all($cursorId, $gencompute());
+    $this->_testRows($rows, $expectedCount);
+  }
+
+  function testAllGenerator() {
+    $this->_testAll("allGenerator", 4, function() {
+      return static function() {
+        $db = new SourceDb();
+        msg::note("query source");
+        yield from $db->all("select * from source");
+      };
+    });
+  }
+}