diff --git a/.idea/php-test-framework.xml b/.idea/php-test-framework.xml
index b9984a7..23ef5c6 100644
--- a/.idea/php-test-framework.xml
+++ b/.idea/php-test-framework.xml
@@ -6,6 +6,7 @@
         <cache>
           <versions>
             <info id="Local/home/jclain/wop/php/nulib/vendor/autoload.php" version="9.6.13" />
+            <info id="Local/vendor/autoload.php" version="9.6.21" />
           </versions>
         </cache>
       </tool>
diff --git a/php/src/str.php b/php/src/str.php
index e703786..9a54876 100644
--- a/php/src/str.php
+++ b/php/src/str.php
@@ -290,6 +290,14 @@ class str {
     return $s;
   }
 
+  /** découper la chaine sur tout ensemble de caractères espaces */
+  static final function split_tokens(?string $s): ?array {
+    $s = self::trim(self::norm_nl($s));
+    if ($s === null) return null;
+    elseif ($s === "") return [];
+    else return preg_split('/\s+/', $s);
+  }
+
   /**
    * joindre les éléments de $parts comme avec implode(), mais en ignorant les
    * valeurs fausses (cela n'inclue pas la chaine "0")
diff --git a/php/tests/strTest.php b/php/tests/strTest.php
index 92785fc..2d69303 100644
--- a/php/tests/strTest.php
+++ b/php/tests/strTest.php
@@ -5,6 +5,14 @@ namespace nulib;
 use nulib\tests\TestCase;
 
 class strTest extends TestCase {
+  function testSplit_tokens() {
+    self::assertNull(str::split_tokens(null));
+    self::assertSame([], str::split_tokens(""));
+    self::assertSame(["token"], str::split_tokens("token"));
+    self::assertSame(["t", "u", "v"], str::split_tokens("  t  u   v  "));
+    self::assertSame(["t", "u", "v", "w"], str::split_tokens("\nt\n\nu\r\nv\rw"));
+  }
+
   function testCamel2us() {
     self::assertSame("a", str::camel2us("a"));
     self::assertSame("aa", str::camel2us("aa"));