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php 隨機密碼生成函數

<?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 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;">密碼生成器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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