array_key_exists
(PHP 4 >= 4.1.0, PHP 5)
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
<?php
$search_array = array("first" => 1, "second" => 4);
if (array_key_exists("first", $search_array)) {
echo "The 'first' element is in the array";
}
?>
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Note:
The name of this function is key_exists()
in PHP 4.0.6.
See also isset(),
array_keys(), and
in_array().