str_rot13
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
str_shuffle
(PHP 4 >= 4.3.0, PHP 5)
str_shuffle — 文字列をランダムにシャッフルする
説明
string str_shuffle
( string
$str
)str_shuffle() は文字列をシャッフルします。 考えられるすべての順列のうちのひとつを作成します。
パラメータ
-
str -
入力文字列。
返り値
シャッフルされた文字列を返します。
例
例1 str_shuffle() の例
<?php
$str = 'abcdef';
$shuffled = str_shuffle($str);
// bfdaec のような文字列を返します
echo $shuffled;
?>
add a note
User Contributed Notes
str_shuffle
qeremy [atta] gmail [dotta] com
24-Feb-2012 11:58
Anonymous
21-Jun-2010 10:32
Shuffle for all encoding formats
<?php
function unicode_shuffle($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;
}
?>
andre at admolin dot com
01-Apr-2010 11:11
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.' );
?>
benshelock at gmail dot com
09-Apr-2009 01:51
<?php
$a = str_shuffle('abcdefghijklmnopqrstuvwxyz1234567890');
echo substr($a,0,6);
?>
Creates a nice 6 digit unique ID similar to that of tinyurl.
merreborn at mailinator dot com
24-Jan-2008 11:46
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.
jojersztajner at OXYGEN dot POLAND
16-Jun-2007 03:27
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.
CygnusX1
14-Feb-2007 01:17
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,$numNonAlpha)
);
}
?>
dzafel at op dot pl
29-Dec-2006 01:16
Very, very simple random password generator, without using rand() function:
<?php
function random_password($chars = 8) {
$letters = 'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
return substr(str_shuffle($letters), 0, $chars);
}
?>
nmoyroud at teledetection dot fr
03-Nov-2005 04:38
Just another update to password builder function. With this version, you can choose the number of alphanumeric characters to add and the number of non-alphanumeric characters. You obtain a more secure password. You can add another characters to the non-alphanumeric list if you need.
If you want a password with 8 alphanumeric and 3 non-alphanumeric characters in a random order, just call :
random_passwd(8,3);
function generatePasswd($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);
}
support at wiredlabs dot net
15-Aug-2005 02:03
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);
}
Qube, Efnet #php
05-Aug-2005 04:20
(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\'), \' \')', $input);
rudigreen at gmail dot com
01-Jul-2005 07:20
Here are 2 functions, one inverts the case of a string and the other one randomizes the captilization in a string, kinda
useful string operations.
<?
//Inverts the case of a string
function invert_case($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 $nstr;
}
//Example:
echo rand_case("pHp rooLz! gUyZ"); //produces something random
echo invert_case("pHP STRiNG sEx");//produces Php strIng SeX
?>
Michiel van den boogaard
17-Jan-2005 02:03
Shortend function for PHP < 4.3
<?php
function RandomPass($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, $numchar);
}
?>
aidan at php dot net
26-Aug-2004 03:31
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
sfalcon_(at)_pymesweb_(dot)_com
26-Aug-2004 08:28
You can use str_shuffle to make simple and nice random passwords:
function random_passwd($numchar) {
$string =str_shuffle("abcefghijklmnopqrstuvwxyz1234567890");
$password = substr($string,1,$numchar);
return($password);
}
echo random_passwd('8') // Will return something like "xa3dh214" =)