CallbackFilterIterator (class)
Introduction
(PHP 5 >= 5.4.0, PHP 7)
Class synopsis
CallbackFilterIterator extends FilterIterator implements OuterIterator {
/* Methods */
public __construct ( Iterator $iterator , callable $callback )
public string accept ( void )/* Inherited methods */
public abstract bool FilterIterator::accept ( void )public FilterIterator::__construct ( Iterator $iterator )public mixed FilterIterator::current ( void )public Iterator FilterIterator::getInnerIterator ( void )public mixed FilterIterator::key ( void )public void FilterIterator::next ( void )public void FilterIterator::rewind ( void )public bool FilterIterator::valid ( void )}
Examples
The callback should accept up to three arguments: the current item, the current key and the iterator, respectively.
Example #1 Available callback arguments
<?php
/**
?*?Callback?for?CallbackFilterIterator
?*
?*?@param?$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
}
?>Any callable may be used; such as a string containing a function name, an array for a method, or an anonymous function.
Example #2 Callback basic examples
<?php
$dir?=?new?FilesystemIterator(__DIR__);
//?Filter?large?files?(?>?100MB)
function?is_large_file($current)?{
????return?$current->isFile()?&&?$current->getSize()?>?104857600;
}
$large_files?=?new?CallbackFilterIterator($dir,?'is_large_file');
//?Filter?directories
$files?=?new?CallbackFilterIterator($dir,?function?($current,?$key,?$iterator)?{
????return?$current->isDir()?&&?!?$iterator->isDot();
});
?>Table of Contents
- CallbackFilterIterator::accept — Calls the callback with the current value, the current key and the inner iterator as arguments
- CallbackFilterIterator::__construct — Create a filtered iterator from another iterator
← CachingIterator::valid
CallbackFilterIterator::accept →
? 1997–2017 The PHP Documentation GroupLicensed under the Creative Commons Attribution License v3.0 or later.
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