PHP Comparison Operators

Rumman Ansari Software Engineer 2020-02-06 5397 Share

☰ Table of Contents

Table of Content:

The PHP comparison operators are used to compare two values (number or string):

Operator	Name	Example	Result
==	Equal	$x == $y	Returns true if $x is equal to $y
===	Identical	$x === $y	Returns true if $x is equal to $y, and they are of the same type
!=	Not equal	$x != $y	Returns true if $x is not equal to $y
<>	Not equal	$x <> $y	Returns true if $x is not equal to $y
!==	Not identical	$x !== $y	Returns true if $x is not equal to $y, or they are not of the same type
>	Greater than	$x > $y	Returns true if $x is greater than $y
<	Less than	$x < $y	Returns true if $x is less than $y
>=	Greater than or equal to	$x >= $y	Returns true if $x is greater than or equal to $y
<=	Less than or equal to	$x <= $y	Returns true if $x is less than or equal to $y
<=>	Spaceship	$x <=> $y	Returns an integer less than, equal to, or greater than zero, depending on if $x is less than, equal to, or greater than $y. Introduced in PHP 7.

Example: == Equal

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 100;  
$y = "100";

var_dump($x == $y); // returns true because values are equal
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: === Identical

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 200;  
$y = "100";

var_dump($x === $y); // returns false because types are not equal
?>  

</body>
</html>

Output:

This will produce the following result



bool(false)

Example: != Not equal

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 20;  
$y = "20";

var_dump($x != $y); // returns false because values are equal
?>  

</body>
</html>

Output:

This will produce the following result



bool(false)

Example: <> Not equal

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 20;  
$y = "20";

var_dump($x <> $y); // returns false because values are equal
?>  

</body>
</html>

Output:

This will produce the following result



bool(false)

Example: !== Not identical

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 100;  
$y = "100";

var_dump($x !== $y); // returns true because types are not equal
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: > Greater than

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 90;
$y = 50;

var_dump($x > $y); // returns true because $x is greater than $y
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: < Less than

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 20;
$y = 50;

var_dump($x < $y); // returns true because $x is less than $y
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: >= Greater than or equal to

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 70;
$y = 70;

var_dump($x >= $y); // returns true because $x is greater than or equal to $y
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: <= Less than or equal to

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 60;
$y = 60;

var_dump($x <= $y); // returns true because $x is less than or equal to $y
?>  

</body>
</html>

Output:

This will produce the following result



bool(true)

Example: <=> Spaceship

Code:



<!DOCTYPE html>
<html>
<body>

<?php
$x = 5;  
$y = 10;

echo ($x <=> $y); // returns -1 because $x is less than $y
echo "<br>";

$x = 10;  
$y = 10;

echo ($x <=> $y); // returns 0 because values are equal
echo "<br>";

$x = 15;  
$y = 10;

echo ($x <=> $y); // returns +1 because $x is greater than $y
?>  

</body>
</html>

Output:

This will produce the following result



-1
0
1

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