$array = array (0 => 100, "color" => "red"); print_r(array_keys ($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));
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