Question

Which is the correct syntax for is not equal to operator

this -> !=

if($ses_startdate != $startdate) {
                echo "I am true";
            }

or this -> !==

if($ses_startdate !== $startdate) {
                echo "I am true";
            }

I had been using !== earlier and it worked without any problem but not it is creating the problem with some condition and when i changed it to != it works fine.. why is that?

Answer 1

!== is more strict than !=, !== also check the datatype.
Examples:

$a = 1;
$b = '1';
$c = 1;
$d = TRUE;
// These are true:
$a == $c;
$a == $b;
$a === $c
$a == $d;
// but these are FALSE:
$a === $b;
$a === $d;