array_keys

Description

Array_keys() returns the keys, numeric and string, from the input array.

If the optional search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the input are returned.

Example 1. Array_keys() example $array = array (0 => 100, "color" => "red"); array_keys ($array); // returns array (0, "color") $array = array (1, 100, 2, 100); array_keys ($array, 100); // returns array (0, 2)

See also array_values().