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ARRAY_KEYS(3) 1 ARRAY_KEYS(3) array_keys - Return all the keys or a subset of the keys of an array SYNOPSIS
array array_keys (array $array, [mixed $search_value], [bool $strict = false]) DESCRIPTION
array_keys(3) returns the keys, numeric and string, from the $array. If the optional $search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the $array are returned. PARAMETERS
o $array - An array containing keys to return. o $search_value - If specified, then only keys containing these values are returned. o $strict - Determines if strict comparison (===) should be used during the search. RETURN VALUES
Returns an array of all the keys in $array. EXAMPLES
Example #1 array_keys(3) example <?php $array = array(0 => 100, "color" => "red"); print_r(array_keys($array)); $array = array("blue", "red", "green", "blue", "blue"); print_r(array_keys($array, "blue")); $array = array("color" => array("blue", "red", "green"), "size" => array("small", "medium", "large")); print_r(array_keys($array)); ?> The above example will output: Array ( [0] => 0 [1] => color ) Array ( [0] => 0 [1] => 3 [2] => 4 ) Array ( [0] => color [1] => size ) SEE ALSO
array_values(3), array_key_exists(3), array_search(3). PHP Documentation Group ARRAY_KEYS(3)