PHP Increment and Decrement Operators: Modifying Variable Values
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Table of Content:
The PHP increment operators are used to increment a variable's value.
The PHP decrement operators are used to decrement a variable's value.
| Operator | Name | Description |
|---|---|---|
| ++$x | Pre-increment | Increments $x by one, then returns $x |
| $x++ | Post-increment | Returns $x, then increments $x by one |
| --$x | Pre-decrement | Decrements $x by one, then returns $x |
| $x-- | Post-decrement | Returns $x, then decrements $x by one |
Example: ++$x Pre-increment
Code:
<!DOCTYPE html> <html> <body> <?php $x = 15; echo ++$x; ?> </body> </html>
Output:
This will produce the following result
16
Example: $x++ Post-increment
Code:
<!DOCTYPE html> <html> <body> <?php $x = 15; echo $x++; ?> </body> </html>
Output:
This will produce the following result
15
Example: --$x Pre-decrement
Code:
<!DOCTYPE html> <html> <body> <?php $x = 15; echo --$x; ?> </body> </html>
Output:
This will produce the following result
14
Example: $x-- Post-decrement
Code:
<!DOCTYPE html> <html> <body> <?php $x = 15; echo $x--; ?> </body> </html>
Output:
This will produce the following result
15