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 →
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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