What’s the difference between equal to v/s strictly equal to and not equal to v/s strictly not equal to in any programming language?
This seems to be confusing at first, but if we execute a small example things get very clear about the working of these operators.
== is called equal to operator.
!= is called not-equal to operator.
=== is called strictly equal to operator.
!== is called strictly not-equal to operator.
In this video tutorial we shall see the differences between == v/s === and != v/s !===
Difference between != v/s !=== and == v/s ===
$a = 1; $b = '1';
Lets assign integer 1 to variable a and string ‘1’ to variable b.
Equal-to v/s Strictly Equal-to
$a == $b true $a === $b false
== operator doesn’t consider the type of variable strictly, thus returns true even though we are comparing a string with an integer. But === operator considers the type of the variable strictly and treats integer and string as two different things and hence returns false.
Not Equal-to v/s Strictly Not Equal-to
$a != $b false $a !== $b true
Similarly, as != operator doesn’t take variable type into strict consideration it thinks $a and $b as equals, hence returns false, but !== returns true as it reads integer and string variables as different.