(PHP 4 >= 4.1.0)
array_key_exists -- Checks if the given key or index exists in the array
Description
bool
array_key_exists ( mixed key, array search)
array_key_exists() returns TRUE if the
given key is set in the array.
key can be any value possible
for an array index.
Example 1. array_key_exists() example $search_array = array("first" => 1, "second" => 4);
if (array_key_exists("first", $search_array)) {
echo "The 'first' element is in the array";
} |
|
Note:
This name of this function is key_exists()
in PHP version 4.0.6.
See also isset().