You can specify the length of the generated string
function Rand_str ($length, $max =false)
{
if (Is_int ($max) && $max > $length)
{
$length = Mt_rand ($length, $max);
}
$output = ';
for ($i =0; $i < $length; $i + +)
{
$which = Mt_rand (0,2);
if ($which = = 0)
{
$output. = Mt_rand (0,9);
}
ElseIf ($which = = 1)
{
$output. = Chr (Mt_rand (65,90));
}
Else
{
$output. = Chr (Mt_rand (97,122));
}
}
return $output;
}
Invoke instance:
$randstr = Rand_str (16);
Functions that generate random strings
<?php
/**
* Generate random string
*
* produces a random string of a specified length and returns it to the user
*
* @access Public
* @param int $len The number of digits that produce a string
* @return String
*/
function Randstr ($len =6) {
$chars = ' abdefghjklmnpqrstvwxyabdefghijkmnpqrstvwxy23456789#%* '; Characters to builds the password from
Mt_srand (Double) Microtime () *1000000*getmypid ()); Seed the random number generater (must is done)
$password = ';
while (strlen ($password) < $len)
$password. =substr ($chars, (Mt_rand ()%strlen ($chars)), 1);
return $password;
}
?>
Create a character Fu Chi.
Function Randomkeys ($length)
{
$pattern = ' 1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklomnopqrstuvwxyz,./&l
t;>?; #:@~[]{}-_=+) (*&^%$?! '; //character Fu Chi
for ($i =0 $i < $length; $i + +)
{
$key. = $pattern {Mt_rand (0,35 )}; //Generate PHP random number
}
return $key;
}
Echo Randomkeys (8);
no need to create character Fu Chi
function Randomkeys ($length)
{
$output = ';
for ($a = 0; $a < $length; $a + +) {
$output. = Chr (Mt_rand (35, 126)); Generate PHP Random number
}
return $output;
}
Echo Randomkeys (8);
random user name and random password example
Randomly generated user name (length 6-13)
function Create_password ($PW _length = 4) {
$randpwd = ';
for ($i = 0; $i < $PW _length; $i + +) {
$randpwd. = Chr (Mt_rand (33, 126));
}
return $randpwd;
}
function Generate_username ($length = 6) {
Password character set, you can add any character you need
$chars = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&* ()-_ []{}<>~ ' +=,.;:/?| ';
$password = ';
for ($i = 0; $i < $length; $i + +)
{
Here are two ways to get a character
The first is to use SUBSTR to intercept any one character in the $chars;
The second is any element that takes the $chars of a character array
$password. = substr ($chars, Mt_rand (0, strlen ($chars)-1), 1);
$password. = $chars [Mt_rand (0, strlen ($chars)-1)];
}
return $password;
}
Call
$userId = ' user '. Generate_username (6);
$pwd = Create_password (9);
Mt_srand generate random seeds, the length of the password can be defined arbitrarily, the longest 32 bits.
<?php
Mt_srand (Double) microtime () * 1000000);
function Gen_random_password ($password _length = $generated _password = "") {
$valid _characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$chars _length = strlen ($valid _characters)-1;
for ($i = $password _length; $i-;) {
$generated _password. = $valid _characters[mt_rand (0, $chars _length)];
$generated _password. = substr ($valid _characters, (Mt_rand ()% (strlen ($valid _characters)), 1);
}
return $generated _password;
}
?>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "HTTP://WWW.W3.ORG/TR/HTML4/LOOSE.DTD" >
<title>php Password Generator </title>
<style type= "Text/css" >
Body {
font-family:arial;
font-size:10pt;
}
</style>
<body>
<span style= "Font-weight:bold; font-size:15pt; " > Password generator </span><br/><br/>
<?php
if (Isset ($_get[' password_length ')) {
if (Preg_match ("/([0-9]{1,8})/", $_get[' Password_length ')) {
Print ("Password generation succeeded: <br/>
<span style= "Font-weight:bold" > ". Gen_random_password ($_get[' password_length ')). "</span><br/><br/>n");
} else {
Print ("Incorrect password length!<br/><br/>n");
}
}
Print <<< End
Please generate the length of its specified build password for the password: <br/><br/>
<form action= "{$_server[' php_self ']}" method= "get" >
<input type= "text" name= "Password_length" >
<input type= "Submit" value= "Build" >
</form>
End
?>
</body>
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