PHP: Incrementing Decrementing Operators

Last update on August 19 2022 21:51:14 (UTC/GMT +8 hours)

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

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