The RecursiveCallbackFilterIterator class

    (PHP 5 >= 5.4.0, PHP 7, PHP 8)

    Introduction

    Examples

    The callback should accept up to three arguments: the current item, the current key and the iterator, respectively.

    Example #1 Available callback arguments

    <?php


    function my_callback($current, $key, $iterator) {
    // Your filtering code here
    }

    ?>

    Filtering a recursive iterator generally involves two conditions. The first is that, to allow recursion, the callback function should return true if the current iterator item has children. The second is the normal filter condition, such as a file size or extension check as in the example below.

    Example #2 Recursive callback basic example

    <?php

    $dir     = new RecursiveDirectoryIterator(__DIR__);

    // Filter large files ( > 100MB)
    $files = new RecursiveCallbackFilterIterator($dir, function ($current, $key, $iterator) {
    // Allow recursion
    if ($iterator->hasChildren()) {
    return     TRUE;
    }
    // Check for large file
    if ($current->isFile() && $current->getSize() > 104857600) {
    return     TRUE;
    }
    return     FALSE;
    });

    foreach (new     RecursiveIteratorIterator($files) as $file) {
    echo     $file->getPathname() . PHP_EOL;
    }

    ?>

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