Array_keys() function :
array_keys will return all the keys of an array
Syntax :array array_keys ( array input [, mixed search_value])
array array_keys ( array input [, mixed search_value])Example :$input_array = array (”key1″ => array(”a,” “b”, “c”), “key2″ => array(”e”, “f”, “g”));
$input_array = array (”key1″ => array(”a,” “b”, “c”), “key2″ => array(”e”, “f”, “g”));print_r(array_keys ($input_array));
//Result will be like
Array ( [0] => key1 [1] => key2 )
