str_shuffle
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
str_shuffle — Randomly shuffles a string
Description
str_shuffle() shuffles a string. One permutation
of all possible is created.
Caution
This function does not generate cryptographically secure values, and must not
be used for cryptographic purposes, or purposes that require returned values to be unguessable.
If cryptographically secure randomness is required, the Random\Randomizer may be
used with the Random\Engine\Secure engine. For simple use cases, the random_int()
and random_bytes() functions provide a convenient and secure API that is backed by
the operating system’s CSPRNG.
Caution
This function uses the global Mt19937 (“Mersenne Twister”) instance as the source of randomness and thus shares its state with all other functions using the global Mt19937.
Using any of these functions advances the sequence for all the other functions, regardless of scope.
Generating repeatable sequences by seeding mt_srand() or srand() with a known value will also yield repeatable output from this function.
Prefer using Random\Randomizer methods in all newly written code.
Parameters
string-
The input string.
Return Values
Returns the shuffled string.
Examples
Example #1 str_shuffle() example
<?php
$str = 'abcdef';
$shuffled = str_shuffle($str);
// This will echo something like: bfdaec
echo $shuffled;
?>
str_rot13
String Functions