in_array

Description

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() function will also check the types of the needle in the haystack.

Example 1. in_array() example <?php $os = array("Mac", "NT", "Irix", "Linux"); if (in_array("Irix", $os)) { print "Got Irix"; } if (in_array("mac", $os)) { print "Got mac"; } ?> The second condition fails because in_array() is case-sensitive, so the program above will display: 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 display: 1.13 found with strict check

Example 3. in_array() with an array as needle <?php $a = array(array('p', 'h'), array('p', 'r'), 'o'); if (in_array(array('p', 'h'), $a)) { echo "'ph' was found\n"; } if (in_array(array('f', 'i'), $a)) { echo "'fi' was found\n"; } if (in_array('o', $a)) { echo "'o' was found\n"; } /* Outputs: 'ph' was found 'o' was found */ ?>

See also array_search(), array_key_exists(), and isset().