PHP: Incrementing Decrementing Operators
Description
PHP supports C-style pre and post increment and decrement operators. The Increment/decrement operators operate only on variables and not on any value.
List of increment/decrement operators
| Example | Name | Effect |
|---|---|---|
| ++$x | Pre-increment | Increments $x by 1, then returns $x. |
| $x++ | Post-increment | Returns $x, then increments $x by 1. |
| --$x | Pre-decrement | Decrements $x by 1, then returns $x. |
| $x-- | Post-decrement | Returns $x, then decrements $x by 1. |
Example:
<?php
$a = 10;
echo 'Value of $a is :'.$a;
echo '<br />After Pre-increment value of $a ( i.e. ++$a ) is: '.++$a;
$a = 20;
echo '<br />Value of $a is :'.$a;
echo '<br />After Post-increment value of $a ( i.e. $a++ ) is: '.$a++;
$a = 30;
echo '<br />Value of $a is :'.$a;
echo '<br />After Pre-decrement value of $a ( i.e. --$a ) is: '.--$a;
$a = 40;
echo '<br />Value of $a is :'.$a;
echo '<br />After Post-decrement value of $a ( i.e. $a-- ) is: '.$a--;
?>
Output:
Value of $a is :10 After Pre-increment value of $a ( i.e. ++$a ) is: 11 Value of $a is :20 After Post-increment value of $a ( i.e. $a++ ) is: 20 Value of $a is :30 After Pre-decrement value of $a ( i.e. --$a ) is: 29 Value of $a is :40 After Post-decrement value of $a ( i.e. $a-- ) is: 40
View the example in the browser
Previous: Array Operators
Next: if else elseif statement