value canoot be null php stack overflow code example
Example: null value in php stackoverflow
/* == operator in PHP doesn't check for type.
==, as you did, PHP treats NULL, false, 0, the
empty string, and empty arrays as equal.
*/
if($variable === NULL) {...}
/* check == vs === */
'' == NULL would return true
0 == NULL would return true
false == null would return true
where as
'' === NULL would return false
0 === NULL would return false
false === NULL would return false