array_key_exists
Checks if the given key or index exists in the array
Description
boolarray_key_exists
mixedkey
arraysearch
array_key_exists returns &true; if the
given key is set in the array.
key can be any value possible
for an array index.
<function>array_key_exists</function> example
1, "second" => 4);
if (array_key_exists("first", $search_array)) {
echo "The 'first' element is in the array";
}
?>
]]>
The name of this function is key_exists
in PHP version 4.0.6.
See also isset.