Advanced Search

PHP Password Strength Calculation

/ Published in: PHP
Save to your folder(s)
Copied it for later use hehe

Expand | Embed | Plain Text

Copy this code and paste it in your HTML 
  1. <?php
  2.  
  3. /**
  4.  *
  5.  * @simple function to test password strength
  6.  *
  7.  * @param string $password
  8.  *
  9.  * @return int 
  10.  *
  11.  */
  12. function testPassword($password)
  13. {
  14.     if ( strlen( $password ) == 0 )
  15.     {
  16.         return 1;
  17.     }
  18.  
  19.     $strength = 0;
  20.  
  21.     /*** get the length of the password ***/
  22.     $length = strlen($password);
  23.  
  24.     /*** check if password is not all lower case ***/
  25.     if(strtolower($password) != $password)
  26.     {
  27.         $strength += 1;
  28.     }
  29.  
  30.     /*** check if password is not all upper case ***/
  31.     if(strtoupper($password) == $password)
  32.     {
  33.         $strength += 1;
  34.     }
  35.  
  36.     /*** check string length is 8 -15 chars ***/
  37.     if($length >= 8 && $length <= 15)
  38.     {
  39.         $strength += 1;
  40.     }
  41.  
  42.     /*** check if lenth is 16 - 35 chars ***/
  43.     if($length >= 16 && $length <=35)
  44.     {
  45.         $strength += 2;
  46.     }
  47.  
  48.     /*** check if length greater than 35 chars ***/
  49.     if($length > 35)
  50.     {
  51.         $strength += 3;
  52.     }
  53.  
  54.     /*** get the numbers in the password ***/
  55.     preg_match_all('/[0-9]/', $password, $numbers);
  56.     $strength += count($numbers[0]);
  57.  
  58.     /*** check for special chars ***/
  59.     preg_match_all('/[|!@#$%&*\/=?,;.:\-_+~^\\\]/', $password, $specialchars);
  60.     $strength += sizeof($specialchars[0]);
  61.  
  62.     /*** get the number of unique chars ***/
  63.     $chars = str_split($password);
  64.     $num_unique_chars = sizeof( array_unique($chars) );
  65.     $strength += $num_unique_chars * 2;
  66.  
  67.     /*** strength is a number 1-10; ***/
  68.     $strength = $strength > 99 ? 99 : $strength;
  69.     $strength = floor($strength / 10 + 1);
  70.  
  71.     return $strength;
  72. }
  73.  
  74. /*** example usage ***/
  75. $password = 'php_tutorials_and_examples!123';
  76. echo testPassword($password);
  77.  
  78. ?>

URL: http://www.phpro.org/examples/Password-Strength-Tester.html

Report this snippet


Comments

RSS Icon Subscribe to comments

You need to login to post a comment.