rsort
sizeof
Array Functions
PHP Manual

# shuffle

(PHP 4, PHP 5)

shuffle — Shuffle an array

### Description

bool shuffle ( array `&$array` )

This function shuffles (randomizes the order of the elements in) an array.

### Parameters

`array`

  The array.

### Return Values

Returns `TRUE` on success or `FALSE` on failure.

### Examples

Example#1 shuffle() example

`<?php
$numbers = range(1, 20);
srand((float)microtime() * 1000000);
shuffle($numbers);
foreach ($numbers as $number) {
echo "$number ";
}
?>`

### Notes

> Note: This function assigns new keys to the elements in `array` . It will remove any existing keys that may have been assigned, rather than just reordering the keys.

> Note: As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.

### See Also

- arsort()
- asort()
- ksort()
- rsort()
- sort()
- usort()

rsort
sizeof
Array Functions
PHP Manual