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in_array
Checks if a value exists in an array
(PHP 4, PHP 5)
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() function
will also check the types of
the needle in the haystack.
Note:
If needle is a string, the comparison is done in a case-sensitive manner.
Note:
In PHP versions before 4.2.0 needle was not allowed to be an array.
Example 306. in_array() example
<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
echo "Got Irix";
}
if (in_array("mac", $os)) {
echo "Got mac";
}
?>The second condition fails because in_array() is case-sensitive, so the program above will display:
Got Irix
Example 307. 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";
}
?>The above example will output:
1.13 found with strict check
Example 308. 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";
}
?>The above example will output:
'ph' was found
'o' was found
See also array_search(), array_key_exists(), and isset().