Custom function code to generate random passwords in php_PHP tutorial

Code 1:

A function that generates a random password. The generated password is a random string of lowercase letters and numbers, and the length can be customized. Relatively speaking, this is relatively simple

Copy code The code is as follows:

/*
* php automatically generates a new password Custom function (with example demonstration)
Applicable environment: 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)]; ;
}
echo "New password: ".genPassword()."
";
echo "New password: ".genPassword(5,10)."
";
?>

Some examples are summarized below for your reference.

Example 1

The simplest generation method

Copy code The code is as follows:

function generatePassword($length=8)

{
$chars = array_merge(range(0,9),
                                                                                                                                                                                                                                         . '$','%','^','&','*'));
shuffle($chars);
$password = '';
for($i=0; $i<8; $i++) {
$password .= $chars[$i];
}
return $password;
}



Example 2

1. Generate a random integer from 33 – 126, such as 35,

2. Convert 35 into the corresponding ASCII code character, such as 35 corresponding to #

3. Repeat the above steps 1 and 2 n times , concatenated into an n-digit password

Copy code

The code is as follows:function create_password($pw_length = 8){

$randpwd = '';

for ($i = 0; $i < $pw_length; $i++)
{
$randpwd .= chr(mt_rand(33, 126));
}
Return $randpwd;
}

// Call this function, passing the length parameter $pw_length = 6
echo create_password(6);

Examples

Copy code

The code is as follows:

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;
}

?>






密码生成器v4.0 by freemouse



if (isset($_GET['password_length'])){
 if(preg_match("/([0-9]{1,8})/", $_GET['password_length'])){
  print("密码生成成功:

" . gen_random_password($_GET['password_length']) . "

n");
 } else {
  print("密码长度不正确!

n");
 }
}

print <<< end
请为密码生成其指定生成密码的长度:

 
 

end;

?>

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 )
{
// Password character set, you can add any characters you need
$chars = array('a', 'b', 'c', 'd', 'e', ​​'f', 'g', 'h',
'i', 'j', 'k', 'l','m', 'n' , 'o', 'p', 'q', 'r', 's',
't', 'u', 'v', 'w', 'x', 'y','z ', 'A', 'B', 'C', 'D',
'E', 'F', 'G', 'H', 'I', 'J', 'K', ' L','M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y','Z',
'0', '1', '2', '3', '4', '5', '6', '7', '8' , '9', '!',
'@','#', '$', '%', '^', '&', '*', '(', ')', '- ', '_',
'[', ']', '{', '}', '<', '>', '~', '`', '+', '=' , ',',
'.', ';', ':', '/', '?', '|');

// Randomly select $length array element key names in $chars
$keys = array_rand($chars, $length);

$password = '';
for($i = 0; $i < $length; $i++)
{
// Concatenate $length array elements into a string
       $password .= $chars[$keys[$i]];
 }

return $password;
}

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