Execute function on every value of a key - Stack Overflow
Array mit Funktion verbinden - PHP array_walk zum Durcharbeiten eines Array
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PHP array_walk_recursive() Function - WebDesignTutorialz
php warning: array_walk_recursive() expects parameter 1 to be array [#2154157] | Drupal.org
GitHub - voku/Arrayy: 🗃 Array manipulation library for PHP, called Arrayy!