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:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">15</span><span class="pun">;</span><span class="pln"> echo </span><span class="pun">++</span><span class="pln">$x</span><span class="pun">;</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="lit">16</span><span class="pln"> </span>
Example: $x++ Post-increment
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">15</span><span class="pun">;</span><span class="pln"> echo $x</span><span class="pun">++;</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="lit">15</span><span class="pln"> </span>
Example: --$x Pre-decrement
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">15</span><span class="pun">;</span><span class="pln"> echo </span><span class="pun">--</span><span class="pln">$x</span><span class="pun">;</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="lit">14</span><span class="pln"> </span>
Example: $x-- Post-decrement
Code:
<span class="pln"> </span><span class="dec"><!DOCTYPE html></span><span class="pln"> </span><span class="tag"><html></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="pun"><?</span><span class="pln">php $x </span><span class="pun">=</span><span class="pln"> </span><span class="lit">15</span><span class="pun">;</span><span class="pln"> echo $x</span><span class="pun">--;</span><span class="pln"> </span><span class="pun">?></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
Output:
This will produce the following result
<span class="pln"> </span><span class="lit">15</span><span class="pln"> </span>
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