Forum PHP 2017

str_shuffle

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

str_shuffleMischia una stringa in modo casuale

Descrizione

string str_shuffle ( string $str )

str_shuffle() mischia una stringa. Viene generata una di tute le possibili permutazioni.

Example #1 Esempio di uso di str_shuffle()

<?php
$str 
'abcdef';
$shuffled str_shuffle($str);

// This will echo something like: bfdaec
echo $shuffled;
?>

Vedere anche: shuffle() e rand().

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User Contributed Notes 10 notes

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40
jojersztajner at OXYGEN dot POLAND
10 years ago
Aoccdrnig to rseearch at an Elingsh uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is that the frist and lsat ltteer is at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit a porbelm. Tihs is bcuseae we do not raed ervey lteter by it slef but the wrod as a wlohe.

Hree's a cdoe taht slerbmcas txet in tihs way:
<?php
   
function scramble_word($word) {
        if (
strlen($word) < 2)
            return
$word;
        else
            return
$word{0} . str_shuffle(substr($word, 1, -1)) . $word{strlen($word) - 1};
    }

    echo
preg_replace('/(\w+)/e', 'scramble_word("\1")', 'A quick brown fox jumped over the lazy dog.');
?>

It may be ufseul if you wnat to cetare an aessblicce CTCPAHA.
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14
qeremy [atta] gmail [dotta] com
5 years ago
A proper unicode string shuffle;

<?php
function str_shuffle_unicode($str) {
   
$tmp = preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
   
shuffle($tmp);
    return
join("", $tmp);
}
?>

$str = "Şeker yârim"; // My sweet love

echo str_shuffle($str); // i�eymrŢekr �

echo str_shuffle_unicode($str); // Şr mreyeikâ
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5
ronald
1 year ago
This page is missing a very important notice:

Caution

This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a cryptographically secure value, consider using random_int(), random_bytes(), or openssl_random_pseudo_bytes() instead.
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4
blamoo2 at hotmail dot com
1 year ago
This function is affected by srand():

<?php
srand
(12345);
echo
str_shuffle('Randomize me') . '<br/>'; // "demmiezr aon"
echo str_shuffle('Randomize me') . '<br/>'; // "izadmeo rmen"

srand(12345);
echo
str_shuffle('Randomize me') . '<br/>'; // "demmiezr aon" again
?>
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3
Anonymous
7 years ago
Shuffle for all encoding formats

<?php

function unicode_shuffle($string, $chars, $format = 'UTF-8')
{
    for(
$i=0; $i<$chars; $i++)
       
$rands[$i] = rand(0, mb_strlen($string, $format));
           
       
$s = NULL;
           
    foreach(
$rands as $r)
       
$s.= mb_substr($string, $r, 1, $format);
           
    return
$s;
}

?>
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2
Anonymous
2 years ago
str_shuffle isn't recommendable for passwords. Each character exists only one time).

A function like the following one is better for this.

<?php
   
function generatePassword($length = 8) {
       
$possibleChars = "abcdefghijklmnopqrstuvwxyz";
       
$password = '';

        for(
$i = 0; $i < $length; $i++) {
           
$rand = rand(0, strlen($possibleChars) - 1);
           
$password .= substr($possibleChars, $rand, 1);
        }

        return
$password;
    }
?>
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1
krzysiekpiasecki at gmail dot com
2 years ago
/**
* Test shuffleString
*/
function testShuffleString() {
    $shuffled = shuffleString("ĄęźćÓ");
    if (\mb_strlen($shuffled) != 5) {
        throw new \UnexpectedValueException("Invalid count of characters");
    }
    if ($shuffled == "ĄęźćÓ") {
        throw new \UnexpectedValueException("The same string");
    }
    foreach (["Ą", "ę", "ź", "ć", "Ó"] as $char) {
        if (\mb_strpos($shuffled, $char) === false) {
            throw new \UnexpectedValueException("Character not found");
        }
    }
}

/**
* Shuffle string
*
* @param $stringValue String to shuffle
* @param string $startWith Shuffle $stringValue and append to $startWith
* @return string Shuffled string
* @author Krzysztof Piasecki<krzysiekpiasecki@gmail.com>
*/
function shuffleString($stringValue, $startWith = "") {
    $range = \range(0, \mb_strlen($stringValue));
    shuffle($range);
    foreach($range as $index) {
        $startWith .= \mb_substr($stringValue, $index, 1);
    }
    return $startWith;
};

testShuffleString();

echo shuffleString("Hello"); // > 'elHol' (something like this)
echo shuffleString("World!", "Hello "); // > 'Hello do!lrW' (something like this)
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2
CygnusX1
10 years ago
To cobine functionality and simplicity of the two functions below we can have:

<?php
function generatePasswd($numAlpha=6,$numNonAlpha=2)
{
  
$listAlpha = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  
$listNonAlpha = ',;:!?.$/*-+&@_+;./*&?$-!,';
   return
str_shuffle(
     
substr(str_shuffle($listAlpha),0,$numAlpha) .
     
substr(str_shuffle($listNonAlpha),0,$numNonAlpha)
    );
}
?>
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2
dzafel at op dot pl
10 years ago
Very, very simple random password generator, without using rand() function:

<?php
function random_password($chars = 8) {
  
$letters = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
   return
substr(str_shuffle($letters), 0, $chars);
}
?>
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-4
Michiel van den boogaard
12 years ago
Shortend function for PHP < 4.3
<?php 
function RandomPass($numchar

   
$word = "a,b,c,d,e,f,g,h,i,j,k,l,m,1,2,3,4,5,6,7,8,9,0"
   
$array=explode(",",$word); 
   
shuffle($array); 
   
$newstring = implode($array,""); 
    return
substr($newstring, 0, $numchar); 

?>
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