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# array_filter

(PHP 4 >= 4.0.6)

array_filter -- Filters elements of an array using a callback function

## Description

``array array_filter` (array input [, mixed callback])`

array_filter() returns an array containing all the elements of `input` filtered according a callback function. If the `input` is an associative array the keys are preserved.

Example 1. array_filter() example
    function odd($var) {
        return ($var % 2 == 1);
    }

    function even($var) {
        return ($var % 2 == 0);
    }

    $array1 = array ("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
    $array2 = array (6, 7, 8, 9, 10, 11, 12);

    $odd_arr = array_filter($array1, "odd");
    $even_arr = array_filter($array2, "even");

This makes `$odd_arr` have `array ("a"=>1, "c"=>3, "e"=>5);`, and `$even_arr` have `array (6, 8, 10, 12);`,

> Note: Instead of a function name, an array containing an object reference and a method name can also be supplied.

See also array_map(), and array_reduce().

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