RecursiveCallbackFilterIterator (class)

The RecursiveCallbackFilterIterator class

Introduction

(PHP 5 >= 5.4.0, PHP 7)

Class synopsis

RecursiveCallbackFilterIterator extends CallbackFilterIterator implements OuterIterator , RecursiveIterator {

/* Methods */

public __construct ( RecursiveIterator $iterator , string $callback )

public RecursiveCallbackFilterIterator getChildren ( void )

public bool hasChildren ( void )

/* Inherited methods */

public string CallbackFilterIterator::accept ( void )

}

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

/**
 * Callback for RecursiveCallbackFilterIterator
 *
 * @param $current   Current item's value
 * @param $key       Current item's key
 * @param $iterator  Iterator being filtered
 * @return boolean   TRUE to accept the current item, FALSE otherwise
 */
function my_callback($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;
}

?>

Table of Contents

• RecursiveCallbackFilterIterator::__construct — Create a RecursiveCallbackFilterIterator from a RecursiveIterator

• RecursiveCallbackFilterIterator::getChildren — Return the inner iterator's children contained in a RecursiveCallbackFilterIterator

• RecursiveCallbackFilterIterator::hasChildren — Check whether the inner iterator's current element has children

← RecursiveCachingIterator::hasChildren

RecursiveCallbackFilterIterator::__construct →

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https://secure.php.net/manual/en/class.recursivecallbackfilteriterator.php