php生成随机密码一些方法总结

<?php
header("Content-type: text/html; charset=utf-8");

function randCode($length) {
    $ranges = array(range('a', 'z'), range('A', 'Z'), range(1, 9));
    $code = '';
    for($i = 0; $i < $length; $i++){
        $rkey = array_rand($ranges);
        $vkey = array_rand($ranges[$rkey]);
        $code .= $ranges[$rkey][$vkey];
    }
    return $code;
}

echo "www.111cn.net";
echo randCode(5); // 输出如：3IxY8、E6HOv、1qHiy等等
?>

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);

//自动为用户随机生成用户名(长度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;

        }

        // 调用该函数

        $userId = 'user'.generate_username(6);

        $pwd = create_password(9);