shuffle
(PHP 4, PHP 5, PHP 7, PHP 8)
shuffle — Shuffle an array
Description
shuffle(array
&$array): boolThis 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.
Parameters
-
array -
The array.
Return Values
Returns true on success or false on failure.
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. |
Examples
Example #1 shuffle() example
<?php
$numbers = range(1, 20);
shuffle($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:
Resets array's internal pointer to the first element.
See Also
- array_rand() - Pick one or more random keys out of an array
- The comparison of array sorting functions
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