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array_filter
PHP Manual
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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);

echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));

The printout of the program above will be: 
Odd :
Array
(
    [a] => 1
    [c] => 3
    [e] => 5
)
Even:
Array
(
    [0] => 6
    [2] => 8
    [4] => 10
    [6] => 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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