Developer Forums | About Us | Site Map
Search  
HOME > PHPMANUAL


Sponsors





Web Host
site hosted by netplex
Partners

Online Manuals

array_filter

(PHP 4 >= 4.0.6)

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

Description

array array_filter ( array input [, callback function])

array_filter() iterates over each value in the input array passing them to the callback function. If the callback function returns true, the current value from input is returned into the result array. Array keys are preserved.

Example 1. array_filter() example

<?php
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
 )

Users may not change the array itself from the callback function. e.g. Add/delete an element, unset the array that array_filter() is applied to. If the array is changed, the behavior of this function is undefined.

See also array_map(), array_reduce(), and array_walk().

Copyright 2004-2017 GrindingGears.com. All rights reserved. Site hosted by NETPLEX