php empty array

if (empty($array)) {
     // list is empty.
}

$emptyArray = []; 
$emptyArray = array();
$emptyArray = (array) null;

$emptyArray = []; 
$emptyArray = array();
$emptyArray = (array) null;

//To clear array you are able to simply re-instantiate it
$foo = array();

//To clear $foo from the symbol table use
unset($foo);

empty($var)