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(PHP 4 >= 4.3.0, PHP 5)
str_shuffle — Mischt einen String nach dem Zufallsprinzip
str_shuffle() mischt eine Zeichenkette. Es entsteht eine Permutation aller vorhandenen Zeichen.
Die Eingabezeichenkette.
Gibt die vermischte Zeichenkette zurück.
Beispiel #1 str_shuffle()-Beispiel
<?php
$str = 'abcdef';
$shuffled = str_shuffle($str);
// erzeugt eine Ausgabe wie: bfdaec
echo $shuffled;
?>
Shuffle for all encoding formats
<?php
function unicode_shuffle($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;
}
?>
Here are nice functions for invert/randomize/alter the capitalization of a string.
<?php
function invert_case( $str ) {
for( $i = 0; $i < strlen( $str ); ++$i ) {
$ret .= ( $str[ $i ] == strtolower( $str[ $i ] ) ) ? strtoupper( $str[ $i ] ) : strtolower( $str[ $i ] );
}
return $ret;
}
function rand_case( $str ) {
for( $i = 0; $i < strlen( $str ); ++$i ) {
$ret .= ( rand( 0, 1 ) == 0 ) ? strtolower( $str[ $i ] ) : strtoupper( $str[ $i ] );
}
return $ret;
}
function alter_case( $str ) {
for( $i = 0; $i < strlen( $str ); ++$i ) {
$ret .= ( $i % 2 == 0 ) ? strtoupper( $str[ $i ] ) : strtolower( $str[ $i ] );
}
return $ret;
}
?>
Examples:
<?php
# o RATO ROEU A ROUPA DO REI DE ROMA.
echo invert_case( 'O rato roeu a roupa do rei de roma.' );
# o RATo RoEU A ROUpA Do reI De rOma.
echo rand_case( 'O rato roeu a roupa do rei de roma.' );
# O RaTo rOeU A RoUpA Do rEi dE RoMa.
echo alter_case( 'O rato roeu a roupa do rei de roma.' );
?>
<?php
$a = str_shuffle('abcdefghijklmnopqrstuvwxyz1234567890');
echo substr($a,0,6);
?>
Creates a nice 6 digit unique ID similar to that of tinyurl.
Re: jojersztajner at OXYGEN dot POLAND
"It may be useful if you want to create an accessible CAPTCHA."
This is a flawed concept, since:
1) It's not really accessible -- your scrambled text would produce incomprehensible output if passed through a screen reader (just imagine what a computer saying "uinervtisy" would sound like)
2) It's in no way secure. A simple script with access to a copy of /usr/dict/words can reduce the space of possible solutions to no more than a handful.
i.e., it's trivial for a script to generate a command like the following, which solves the "uinervtisy" example 100% of the time:
php@server:~$ egrep -i '^u[inervts]{8}y$' /usr/share/dict/words
university
php@server:~$
Novel idea, but it would take a clever spammer all of 5 minutes to defeat it completely.
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.
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,$numNonAlpha)
);
}
?>
Very, very simple random password generator, without using rand() function:
<?php
function random_password($chars = 8) {
$letters = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
return substr(str_shuffle($letters), 0, $chars);
}
?>
Just another update to password builder function. With this version, you can choose the number of alphanumeric characters to add and the number of non-alphanumeric characters. You obtain a more secure password. You can add another characters to the non-alphanumeric list if you need.
If you want a password with 8 alphanumeric and 3 non-alphanumeric characters in a random order, just call :
random_passwd(8,3);
function generatePasswd($numAlpha=6,$numNonAlpha=2) {
$pwd = '';
$listAlpha = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
$listNonAlpha = ',;:!?.$/*-+&@_+;./*&?$-!,';
$start = mt_rand(1, (strlen($listAlpha)-$numAlpha));
$string = str_shuffle($listAlpha);
$pwd .= substr($string,$start,$numAlpha);
$start = mt_rand(1, (strlen($listNonAlpha)-$numNonAlpha));
$string = str_shuffle($listNonAlpha);
$pwd .= substr($string,$start,$numNonAlpha);
return str_shuffle($pwd);
}
Just an update to sfalcon's function. Chooses a random number within the length and then selects a random segment not the current segment of 1 to $numchar. Also added upper-case chars.
function random_passwd($numchar=8) {
$str = "abcefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$start = mt_rand(1, (strlen($str)-$numchar));
$string = str_shuffle($str);
$password = substr($string,$start,$numchar);
return($password);
}
(correction)
I balked at the loop method used below in inverting and randomising capitalisation and released that we just need to flip the bit (3rd bit or 6th depending on what way you look at it) and it would cause the case change in a character.
Full code and example:
http://www.pgregg.com/projects/php/code/str_case.php
(append an s to the url to get the .phps source)
I came up with a method and thanks to arpad (optimising as ever! :) we now have:
Invert case:
preg_replace('/[a-z]/ie', '\'$0\' ^ str_pad(\'\', strlen(\'$0\'), \' \')', $input);
Randomise case:
preg_replace('/[a-z]/ie', '(rand(0,1) ? \'$0\' ^ str_pad(\'\', strlen(\'$0\'), \' \') : \'$0\')', $input);
and for good measure:
Upper case:
preg_replace('/[a-z]/e', '\'$0\' & str_pad(\'\', strlen(\'$0\'), chr(223))', $input);
Lower case:
preg_replace('/[A-Z]/e', '\'$0\' | str_pad(\'\', strlen(\'$0\'), \' \')', $input);
Here are 2 functions, one inverts the case of a string and the other one randomizes the captilization in a string, kinda
useful string operations.
<?
//Inverts the case of a string
function invert_case($str)
{
$nstr = '';
for($i=0;$i<strlen($str);$i++)
{
$char = substr($str,$i,1);
//If it's lower case make it upper case
if($char == strtolower($char))
{
$char = strtoupper($char);
}
else //if it's upper than make it lower
{
$char = strtolower($char);
}
$nstr .= $char;
}
return $nstr;
}
//Randomly capilizes/uncaptilizes chars in a string
function rand_case($str)
{
$nstr = '';
for($i=0;$i<strlen($str);$i++)
{
$char = substr($str,$i,1);
$char = invert_case($char);
//2 options, to change or not to change
rand(0,1) == 1 ? $char = invert_case($char) : null;
$nstr .= $char;
}
return $nstr;
}
//Example:
echo rand_case("pHp rooLz! gUyZ"); //produces something random
echo invert_case("pHP STRiNG sEx");//produces Php strIng SeX
?>
Shortend function for PHP < 4.3
<?php
function RandomPass($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, $numchar);
}
?>
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
You can use str_shuffle to make simple and nice random passwords:
function random_passwd($numchar) {
$string =str_shuffle("abcefghijklmnopqrstuvwxyz1234567890");
$password = substr($string,1,$numchar);
return($password);
}
echo random_passwd('8') // Will return something like "xa3dh214" =)
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