in_array

(PHP 4 >= 4.0.0)

in_array -- Return TRUE if a value exists in an array

Description

bool in_array (mixed needle, array haystack [, bool strict])

Searches haystack for needle and returns TRUE if it is found in the array, FALSE otherwise.

If the third parameter strict is set to TRUE then the in_array() will also check the types of the needle in the haystack.

Example 1. in_array() example


$os = array ("Mac", "NT", "Irix", "Linux");
if (in_array ("Irix", $os)) {
    print "Got Irix";
}
      

Example 2. in_array() with strict example


<?php
$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, TRUE))
    echo "'12.4' found with strict check\n";
if (in_array(1.13, $a, TRUE))
    echo "1.13 found with strict check\n";
?>

// This will output:

1.13 found with strict check
      

See also array_search().