52 lines
1.5 KiB
PHP
52 lines
1.5 KiB
PHP
<?PHP
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// Generates a strong password of N length containing at least one lower case letter,
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// one uppercase letter, one digit, and one special character. The remaining characters
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// in the password are chosen at random from those four sets.
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//
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// The available characters in each set are user friendly - there are no ambiguous
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// characters such as i, l, 1, o, 0, etc. This, coupled with the $add_dashes option,
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// makes it much easier for users to manually type or speak their passwords.
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//
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// Note: the $add_dashes option will increase the length of the password by
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// floor(sqrt(N)) characters.
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function generateStrongPassword($length = 8, $add_dashes = false, $available_sets = 'luds')
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{
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$sets = array();
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if(strpos($available_sets, 'l') !== false)
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$sets[] = 'abcdefghjkmnpqrstuvwxyz';
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if(strpos($available_sets, 'u') !== false)
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$sets[] = 'ABCDEFGHJKMNPQRSTUVWXYZ';
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if(strpos($available_sets, 'd') !== false)
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$sets[] = '23456789';
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if(strpos($available_sets, 's') !== false)
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$sets[] = '!@#$%&*?';
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$all = '';
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$password = '';
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foreach($sets as $set)
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{
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$password .= $set[array_rand(str_split($set))];
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$all .= $set;
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}
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$all = str_split($all);
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for($i = 0; $i < $length - count($sets); $i++)
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$password .= $all[array_rand($all)];
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$password = str_shuffle($password);
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if(!$add_dashes)
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return $password;
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$dash_len = floor(sqrt($length));
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$dash_str = '';
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while(strlen($password) > $dash_len)
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{
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$dash_str .= substr($password, 0, $dash_len) . '-';
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$password = substr($password, $dash_len);
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}
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$dash_str .= $password;
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return $dash_str;
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}
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