Incrementing/Decrementing Operators in PHP

What are the Incrementing/Decrementing Operators ?

Explanation

PHP supports pre/post increment and decrement operators. The following table lists all the operators

Example	Name	Effect
++$a	Pre-increment	Increments $a by one, then returns $a.
$a++	Post-increment	Returns $a, then increments $a by one.
--$a	Pre-decrement	Decrements $a by one, then returns $a.
$a--	Post-decrement	Returns $a, then decrements $a by one.

Post Increment/Decrement Operators

Example :

<?php
$a = 5;
//Post Increment
echo "Value of a: " . $a++ ." n";
echo "Value of a post incremented: " . $a . " n";
//Post Decrement
$a = 5;
echo "Value of a: " . $a-- . " n";
echo "Value of a post decremented: " . $a . " n";
?>

Result :

Value of a: 5
Value of a post incremented: 6
Value of a: 5
Value of a post decremented: 4

In the above example, when the post increment or decrement operator is called it returns the same value, after that it increments or decrements the value.

Pre Increment/Decrement Operators

Example :

<?php
Pre Increment
$a = 5;
echo "Pre incremented value: " .++$a . " n";
echo "Value is same: " .$a . " n";
Pre Decrement
$a = 5;
echo "Pre decremented value: ".--$a ." n";
echo "Value is same: ".$a ." n";
?>

Result :

Pre incremented value: 6
Value is same: 6
Pre decremented value: 4
Value is same: 4

In the above example, when the pre increment or decrement operator is called it returns decremented or incremented value first.

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