代码一：生成一个随机密码的函数，生成的密码为小写字母与数字的随机字符串，长度可自定义。相对来说，这个比较简单
复制代码 代码如下:
<?php
/*
* php自动生成新密码自定义函数（带实例演示）
适用环境： PHP5.2.x / mysql 5.0.x
* */
function genPassword($min = 5, $max = 8)
{
$validchars="abcdefghijklmnopqrstuvwxyz123456789";
$max_char=strlen($validchars)-1;
$length=mt_rand($min,$max);
$password = "";
for($i=0;$i<$length;$i )
{
$password.=$validchars[mt_rand(0,$max_char)];
}
return $password;
}
echo "新密码：".genPassword()."<br>";
echo "新密码：".genPassword(5,10)."<br>";
?>
下面总结了一些实例各位朋友可参考。
例1
最简洁的生成方法
复制代码 代码如下:
function generatePassword($length=8)
{
$chars = array_merge(range(0,9),
range("a","z"),
range("A","Z"),
array("!","@","$","%","^","&","*"));
shuffle($chars);
$password = "";
for($i=0; $i<8; $i++) {
$password .= $chars[$i];
}
return $password;
}
例2
1、在 33 – 126 中生成一个随机整数，如 35，
2、将 35 转换成对应的ASCII码字符，如 35 对应 #
3、重复以上 1、2 步骤 n 次，连接成 n 位的密码
复制代码 代码如下:
function create_password($pw_length = 8)
{
$randpwd = "";
for ($i = 0; $i < $pw_length; $i++)
{
$randpwd .= chr(mt_rand(33, 126));
}
return $randpwd;
}
// 调用该函数，传递长度参数$pw_length = 6
echo create_password(6);
实例
复制代码 代码如下:
<?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 $generated_password;
} ?><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>php 密码生成器 v 4.0</title>
<style type="text/css">
body {
font-family: Arial;
font-size: 10pt;
}
</style>
</head>
<body>
<span style="font-weight: bold; font-size: 15pt;">密码生成器v4.0 by freemouse</span><br /><br />
<?php if (isset($_GET["password_length"])){
if(preg_match("/([0-9]{1,8})/", $_GET["password_length"])){
print("密码生成成功:<br />
<span style="font-weight: bold">" . gen_random_password($_GET["password_length"]) . "</span><br /><br />n");
} else {
print("密码长度不正确!<br /><br />n");
}
} print <<< end
请为密码生成其指定生成密码的长度:<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>
例4
1、预置一个的字符串 $chars ，包括 a – z，A – Z，0 – 9，以及一些特殊字符
2、在 $chars 字符串中随机取一个字符
3、重复第二步 n 次，可得长度为 n 的密码
复制代码 代码如下:
function generate_password( $length = 8 ) {
// 密码字符集，可任意添加你需要的字符
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|";
$password = "";
for ( $i = 0; $i < $length; $i++ )
{
// 这里提供两种字符获取方式
// 第一种是使用 substr 截取$chars中的任意一位字符；
// 第二种是取字符数组 $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;
}
上面经过测试性能都不如下面这个
1、预置一个的字符数组 $chars ，包括 a – z，A – Z，0 – 9，以及一些特殊字符
2、通过array_rand()从数组 $chars 中随机选出 $length 个元素
3、根据已获取的键名数组 $keys，从数组 $chars 取出字符拼接字符串。该方法的缺点是相同的字符不会重复取。
复制代码 代码如下:
function make_password( $length = 8 )
{
// 密码字符集，可任意添加你需要的字符
$chars = array("a", "b", "c", "d", "e", "f", "g", "h",
"i", "j", "k", "l","m", "n", "o", "p", "q", "r", "s",
"t", "u", "v", "w", "x", "y","z", "A", "B", "C", "D",
"E", "F", "G", "H", "I", "J", "K", "L","M", "N", "O",
"P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y","Z",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "!",
"@","#", "$", "%", "^", "&", "*", "(", ")", "-", "_",
"[", "]", "{", "}", "<", ">", "~", "`", "+", "=", ",",
".", ";", ":", "/", "?", "|");
// 在 $chars 中随机取 $length 个数组元素键名
$keys = array_rand($chars, $length);
$password = "";
for($i = 0; $i < $length; $i++)
{
// 将 $length 个数组元素连接成字符串
$password .= $chars[$keys[$i]];
}
return $password;
}
