PHP: verificare i requisiti formali di una password

Con PHP possiamo verificare i requisiti formali di una password.

La soluzione è la seguente:

function my_check_pwd($password, $requirements = []) {
    $errors = [];
    
    if(strlen($password) < $requirements['length']) {
       $errors[] = 'At least ' . $requirements['length'] . ' characters.'; 
    }

    if($requirements['uppercaselowercase']) {

      if (!preg_match('/(?=.*[a-z])(?=.*[A-Z])/', $password)) {
          $errors[] = 'Password should include uppercase and lowercase characters.';
      }

    }

    $found_digits = preg_match_all('/\d/', $password, $matches);

    if ($found_digits < $requirements['digits']) {
       $errors[] = 'Password should include at least ' . $requirements['digits'] . ' digits.';         
    }

    $found_symbols = preg_match_all('/[@%&!*(){}<>\[\]^\?\/|#]/', $password, $matches);

    if ($found_symbols < $requirements['symbols']) {
       $errors[] = 'Password should include at least ' . $requirements['symbols'] . ' special character.';         
    }

    return $errors;    
}