PHP MYSQL - Operators - 5.3 Comparison Operators
PHP Comparison Operators
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 | |
<!DOCTYPE html>
<html>
<body>
<?php
$x = 10;
$y = "10";
var_dump($x == $y); // returns true because values are equal
?>
</body>
</html>
Output:
bool(true)because values are same, even datatypes are different.
Example (===)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 10;
$y = "10";
var_dump($x === $y); // returns false because types are not equal
?>
</body>
</html>
Output:
bool(false)because values same but datatypes are different.
Example (!=)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = "100";
var_dump($x != $y); // returns false because values are equal
?>
</body>
</html>
Output:
bool(false)Example (<>)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = "100";
var_dump($x != $y); // returns false because values are equal
?>
</body>
</html>
Output:
bool(false)Example(!==)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = "100";
var_dump($x !== $y); // returns true because types are not equal
?>
</body>
</html>
Output:
bool(true)
Example (>)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = 50;
var_dump($x > $y); // returns true because $x is greater than $y
?>
</body>
</html>
Output:
bool(true)
Example (>=)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = 50;
var_dump($x > =$y); // returns true because $x is greater than $y
?>
</body>
</html>
Output:
bool(true)
Example (<)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = 50;
var_dump($x < $y); // returns true because $x is greater than $y
?>
</body>
</html>
Output:
bool(false)
Example (<=)
<!DOCTYPE html>
<html>
<body>
<?php
$x = 100;
$y = 50;
var_dump($x > $y); // returns true because $x is greater than $y
?>
</body>
</html>
Output:
bool(false)
