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 )

See also array_map() and array_reduce().