如果要做到安全密碼與用戶名都隨機我有一個朋友做服務器的登錄密碼與用戶名就是使用了phpmyadmin隨機生成密碼功能來做的,與其用phpmyadmin不如自己做了,下文整理了一些關于php隨機密碼生成的自定義函數供大家參考.
可以指定生成的字符串長度,代碼如下:
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 $output;
}
調用實例:$randstr = rand_str(16);
生成隨機字符串的函數,代碼如下:
<?php
/**
* 產生隨機字符串
*
* 產生一個指定長度的隨機字符串,并返回給用戶
*
* @access public
* @param int $len 產生字符串的位數
* @return string
*/
function randStr($len=6) {
$chars='ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy23456789#%*'; // characters to build the password from
mt_srand((double)microtime()*1000000*getmypid()); // seed the random number generater (must be done)
$password='';
while(strlen($password)<$len)
$password.=substr($chars,(mt_rand()%strlen($chars)),1);
return $password;
}
?>
創建字符池.
function randomkeys($length)
{
$pattern = '1234567890abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLOMNOPQRSTUVWXYZ,./&l
t;>?;#:@~[]{}-_=+)(*&^%$?!'; //字符池
for($i=0; $i<$length; $i++)
{
$key .= $pattern{mt_rand(0,35)}; //生成php隨機數
}
return $key;
}
echo randomkeys(8);
無需創建字符池
function randomkeys($length)
{
$output='';
for ($a = 0; $a < $length; $a++) {
$output .= chr(mt_rand(35, 126)); //生成php隨機數
}
return $output;
}
echo randomkeys(8);
隨機用戶名和隨機密碼例子:
//隨機生成用戶名(長度6-13)
function create_password($pw_length = 4){
$randpwd = '';
for ($i = 0; $i < $pw_length; $i++){
$randpwd .= chr(mt_rand(33, 126));
}
return $randpwd;
}
function generate_username( $length = 6 ) {
// 密碼字符集，可任意添加你需要的字符
$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|';
$password = '';
for ( $i = 0; $i < $length; $i++ )
{
// 這里提供兩種字符獲取方式
// 第一種是使用substr 截取$chars中的任意一位字符；
// 第二種是取字符數組$chars 的任意元素
// $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
$password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
}
return $password;
}
//調用
$userId = 'user'.generate_username(6);
$pwd = create_password(9);
mt_srand生成隨機種子,密碼的長度可以隨意定義,最長32位.
<?php
mt_srand((double) microtime() * 1000000);
function gen_random_password($password_length = 32, $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 $generated_password;
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>php密碼生成器</title>
<style type="text/css">
body {
font-family: Arial;
font-size: 10pt;
}
</style>
</head>
<body>
<span style="font-weight: bold; font-size: 15pt;">密碼生成器</span><br /><br />
<?php
if (isset($_GET['password_length'])){
if(preg_match("/([0-9]{1,8})/", $_GET['password_length'])){
print("密碼生成成功:<br />
<span style="font-weight: bold">" . gen_random_password($_GET['password_length']) . "</span><br /><br />n");
} else {
print("密碼長度不正確!<br /><br />n");
}
}
print <<< end
請為密碼生成其指定生成密碼的長度:<br /><br />
<form action="{$_SERVER['PHP_SELF']}" method="get">
<input type="text" name="password_length">
<input type="submit" value="生成">
</form>
end;
?>
</body>
</html>
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