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shuffle

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(PHP 4, PHP 5, PHP 7)

shuffle — Shuffle an array

Description

shuffle ( array &$array ) : bool

This function shuffles (randomizes the order of the elements in) an array. It uses a pseudo random number generator that is not suitable for cryptographic purposes.

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Return Values

Returns TRUE on success or FALSE on failure.

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Changelog

Version Description
7.1.0 The internal randomization algorithm has been changed to use the » Mersenne Twister Random Number Generator instead of the libc rand function.

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Examples

Example #1 shuffle() example

<?php
$numbers = range(1, 20);
shuffle($numbers);
foreach ($numbers as $number) {
    echo "$number ";
}
?>

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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.

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Document created the 30/01/2003, last modified the 26/10/2018
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References

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