diff --git a/php/src/app/TODO.md b/php/src/app/TODO.md
index bec0657..4b12019 100644
--- a/php/src/app/TODO.md
+++ b/php/src/app/TODO.md
@@ -1,8 +1,5 @@
 # nulib\app
 
-* [ ] ajouter des méthodes normalisées `app::get_cachedir()` et
-  `app::get_cachefile($name)` avec la valeur par défaut
-  `cachedir = $vardir/cache`
 * [ ] `app::action()` et `app::step()` appellent automatiquement
   `app::_dispatch_signals()`
 
diff --git a/php/src/app/app.php b/php/src/app/app.php
index c3fcdd4..87b88bc 100644
--- a/php/src/app/app.php
+++ b/php/src/app/app.php
@@ -36,6 +36,7 @@ class app {
         "datadir" => $app::DATADIR,
         "etcdir" => $app::ETCDIR,
         "vardir" => $app::VARDIR,
+        "cachedir" => $app::CACHEDIR,
         "logdir" => $app::LOGDIR,
         "appgroup" => $app::APPGROUP,
         "name" => $app::NAME,
@@ -51,6 +52,7 @@ class app {
         "datadir" => constant("$app::DATADIR"),
         "etcdir" => constant("$app::ETCDIR"),
         "vardir" => constant("$app::VARDIR"),
+        "cachedir" => constant("$app::CACHEDIR"),
         "logdir" => constant("$app::LOGDIR"),
         "appgroup" => constant("$app::APPGROUP"),
         "name" => constant("$app::NAME"),
@@ -84,6 +86,7 @@ class app {
         "datadir",
         "etcdir",
         "vardir",
+        "cachedir",
         "logdir",
         "profile",
         "facts",
@@ -172,6 +175,7 @@ class app {
         "datadir" => $datadir,
         "etcdir" => $etcdir,
         "vardir" => $vardir,
+        "cachedir" => $cachedir,
         "logdir" => $logdir,
       ] = $params;
       $cwd = $params["cwd"] ?? null;
@@ -223,6 +227,11 @@ class app {
       if ($vardir === false) $vardir = $params["vardir"] ?? null;
       if ($vardir === null) $vardir = "var";
       $vardir = path::reljoin($datadir, $vardir);
+      # cachedir
+      $cachedir = getenv("${PROJCODE}_CACHEDIR");
+      if ($cachedir === false) $cachedir = $params["cachedir"] ?? null;
+      if ($cachedir === null) $cachedir = "cache";
+      $cachedir = path::reljoin($vardir, $cachedir);
       # logdir
       $logdir = getenv("${PROJCODE}_LOGDIR");
       if ($logdir === false) $logdir = $params["logdir"] ?? null;
@@ -250,6 +259,7 @@ class app {
     $this->datadir = $datadir;
     $this->etcdir = $etcdir;
     $this->vardir = $vardir;
+    $this->cachedir = $cachedir;
     $this->logdir = $logdir;
 
     # name, title
@@ -319,6 +329,12 @@ class app {
     return $this->vardir;
   }
 
+  protected string $cachedir;
+
+  function getCachedir(): string {
+    return $this->cachedir;
+  }
+
   protected string $logdir;
 
   function getLogdir(): string {
@@ -449,6 +465,7 @@ class app {
       "datadir" => $this->datadir,
       "etcdir" => $this->etcdir,
       "vardir" => $this->vardir,
+      "cachedir" => $this->cachedir,
       "logdir" => $this->logdir,
       "profile" => $this->getProfile(),
       "facts" => $this->facts,
@@ -464,7 +481,7 @@ class app {
    * une valeur de la forme "$ETCDIR/$name[.$profile].conf"
    */
   function getEtcfile(?string $name=null, $profile=null): string {
-    if ($name === null) $name = "{$this->name}.conf";
+    $name ??= "{$this->name}.conf";
     return $this->findFile([$this->etcdir], [$name], $profile);
   }
 
@@ -473,13 +490,25 @@ class app {
    * valeur de la forme "$VARDIR/$appgroup/$name[.$profile].tmp"
    */
   function getVarfile(?string $name=null, $profile=null): string {
-    if ($name === null) $name = "{$this->name}.tmp";
+    $name ??= "{$this->name}.tmp";
     $file = $this->fencedJoin($this->vardir, $this->appgroup, $name);
     $file = $this->withProfile($file, $profile);
     sh::mkdirof($file);
     return $file;
   }
 
+  /**
+   * obtenir le chemin vers le fichier de cache. par défaut, retourner une
+   * valeur de la forme "$CACHEDIR/$appgroup/$name[.$profile].cache"
+   */
+  function getCachefile(?string $name=null, $profile=null): string {
+    $name ??= "{$this->name}.cache";
+    $file = $this->fencedJoin($this->cachedir, $this->appgroup, $name);
+    $file = $this->withProfile($file, $profile);
+    sh::mkdirof($file);
+    return $file;
+  }
+
   /**
    * obtenir le chemin vers le fichier de log. par défaut, retourner une
    * valeur de la forme "$LOGDIR/$appgroup/$name.log" (sans le profil, parce
@@ -493,10 +522,10 @@ class app {
       $name = "{$this->name}.log";
       $profile ??= false;
     }
-    $file = $this->fencedJoin($this->logdir, $this->appgroup, $name);
-    $file = $this->withProfile($file, $profile);
-    sh::mkdirof($file);
-    return $file;
+    $logfile = $this->fencedJoin($this->logdir, $this->appgroup, $name);
+    $logfile = $this->withProfile($logfile, $profile);
+    sh::mkdirof($logfile);
+    return $logfile;
   }
 
   /**
diff --git a/php/src/app/cli/Application.php b/php/src/app/cli/Application.php
index 8c943c2..2fcfdcc 100644
--- a/php/src/app/cli/Application.php
+++ b/php/src/app/cli/Application.php
@@ -67,6 +67,7 @@ abstract class Application {
   const DATADIR = null;
   const ETCDIR = null;
   const VARDIR = null;
+  const CACHEDIR = null;
   const LOGDIR = null;
 
   /** @var bool faut-il activer automatiquement l'écriture dans les logs */
diff --git a/php/src/app/config/ConfigManager.php b/php/src/app/config/ConfigManager.php
index abcef01..d2b2ec2 100644
--- a/php/src/app/config/ConfigManager.php
+++ b/php/src/app/config/ConfigManager.php
@@ -132,7 +132,7 @@ class ConfigManager {
     }
 
     $value = $this->_getValue($pkey, $default, $inProfile);
-    $this->cacheSet($pkey, $default, $inProfile);
+    $this->cacheSet($pkey, $value, $inProfile);
     return $value;
   }