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- <?PHP
- // Generates a strong password of N length containing at least one lower case letter,
- // one uppercase letter, one digit, and one special character. The remaining characters
- // in the password are chosen at random from those four sets.
- //
- // The available characters in each set are user friendly - there are no ambiguous
- // characters such as i, l, 1, o, 0, etc. This, coupled with the $add_dashes option,
- // makes it much easier for users to manually type or speak their passwords.
- //
- // Note: the $add_dashes option will increase the length of the password by
- // floor(sqrt(N)) characters.
- function generateStrongPassword($length = 9, $add_dashes = false, $available_sets = 'luds')
- {
- $sets = array();
- if(strpos($available_sets, 'l') !== false)
- $sets[] = 'abcdefghjkmnpqrstuvwxyz';
- if(strpos($available_sets, 'u') !== false)
- $sets[] = 'ABCDEFGHJKMNPQRSTUVWXYZ';
- if(strpos($available_sets, 'd') !== false)
- $sets[] = '23456789';
- if(strpos($available_sets, 's') !== false)
- $sets[] = '!@#$%&*?';
- $all = '';
- $password = '';
- foreach($sets as $set)
- {
- $password .= $set[array_rand(str_split($set))];
- $all .= $set;
- }
- $all = str_split($all);
- for($i = 0; $i < $length - count($sets); $i++)
- $password .= $all[array_rand($all)];
- $password = str_shuffle($password);
- if(!$add_dashes)
- return $password;
- $dash_len = floor(sqrt($length));
- $dash_str = '';
- while(strlen($password) > $dash_len)
- {
- $dash_str .= substr($password, 0, $dash_len) . '-';
- $password = substr($password, $dash_len);
- }
- $dash_str .= $password;
- return $dash_str;
- }
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