PHP Increment/Decrement Operators are used to increase or decrease the value of a variable by a certain amount.
They are essential in performing mathematical operations, loops, and other basic programming tasks.
The two types of Increment/Decrement Operators:
Pre-Increment/Decrement Operators
Post-Increment/Decrement Operators
Pre-Increment/Decrement Operators
Pre-Increment/Decrement Operators increase/decrease the value of a variable before the current expression is evaluated.
Post-Increment/Decrement Operators
Post-Increment/Decrement Operators increase/decrease the value of a variable after the current expression is evaluated.
Operator
Name
Syntax
Operation
++
Pre-Increment
++$a
First increments $a by one, then return $a
--
Pre-Decrement
–$a
First decrements $a by one, then return $a
++
Post-Increment
$a++
First returns $a, then increment it by one
--
Post-Decrement
$a–
First returns $a, then decrement it by one
Sample Code
<?php
$a = 2;
echo ++$a, " First increments then prints <br>";
echo $a, "<br>";
$a = 2;
echo $a++, " First prints then increments <br>";
echo $a, "<br>";
$a = 2;
echo --$a, " First decrements then prints <br>";
echo $a, "<br>";
$a = 2;
echo $a--, " First prints then decrements <br>";
echo $a;
?>
Output
3 First increments then prints
3
2 First prints then increments
3
1 First decrements then prints
1
2 First prints then decrements
1
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