iterator_apply

(PHP 5 >= 5.1.0, PHP 7)

Call a function for every element in an iterator

int iterator_apply ( Traversable $iterator, callable $function [, array $args ] )

Calls a function for every element in an iterator.

Parameters:

iterator

The class to iterate over.

function

The callback function to call on every element.

Note: The function must return TRUE in order to continue iterating over the iterator.

args

Arguments to pass to the callback function.

Returns:

Returns the iteration count.

Examples:

iterator_apply() example

<?php
function print_caps(Iterator $iterator) {
    echo strtoupper($iterator->current()) . "\n";
    return TRUE;
}

$it = new ArrayIterator(array("Apples", "Bananas", "Cherries"));
iterator_apply($it, "print_caps", array($it));
?>

The above example will output:

APPLES
BANANAS
CHERRIES