{干货}PHP生成随机密码

随机生成密码的函数，长度可以自定义。

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()."";  
    echo "新密码：".genPassword(5,10)."
";
?>