original_string: protected function _rfc822IsAtext($chr, $validate = null)
      {
          if (!$this->_params['validate'] && !is_null($validate)) {
              return strcspn($chr, $validate);
          }
  
          $ord = ord($chr);
  
          /* UTF-8 characters check. */
          if ($ord > 127) {
              return ($this->_params['validate'] === 'eai');
          }
  
          /* Check for DISALLOWED characters under both RFCs 5322 and 6532. */
  
          /* Unprintable characters && [SPACE] */
          if ($ord <= 32) {
              return false;
          }
  
          /* "(),:;<>@[\] [DEL] */
          switch ($ord) {
          case 34:
          case 40:
          case 41:
          case 44:
          case 58:
          case 59:
          case 60:
          case 62:
          case 64:
          case 91:
          case 92:
          case 93:
          case 127:
              return false;
          }
  
          return true;
      }
code: protected function _rfc822IsAtext($chr, $validate = null)
      {
          if (!$this->_params['validate'] && !is_null($validate)) {
              return strcspn($chr, $validate);
          }
  
          $ord = ord($chr);
  
          /* UTF-8 characters check. */
          if ($ord > 127) {
              return ($this->_params['validate'] === 'eai');
          }
  
          /* Check for DISALLOWED characters under both RFCs 5322 and 6532. */
  
          /* Unprintable characters && [SPACE] */
          if ($ord <= 32) {
              return false;
          }
  
          /* "(),:;<>@[\] [DEL] */
          switch ($ord) {
          case 34:
          case 40:
          case 41:
          case 44:
          case 58:
          case 59:
          case 60:
          case 62:
          case 64:
          case 91:
          case 92:
          case 93:
          case 127:
              return false;
          }
  
          return true;
      }
code_tokens: protected function _rfc822IsAtext ( $ chr , $ validate = null ) { if ( ! $ this -> _params [ 'validate' ] && ! is_null ( $ validate ) ) { return strcspn ( $ chr , $ validate ) ; } $ ord = ord ( $ chr ) ; /* UTF-8 characters check. */ if ( $ ord > 127 ) { return ( $ this -> _params [ 'validate' ] === 'eai' ) ; } /* Check for DISALLOWED characters under both RFCs 5322 and 6532. */ /* Unprintable characters && [SPACE] */ if ( $ ord <= 32 ) { return false ; } /* "(),:;<>@[\] [DEL] */ switch ( $ ord ) { case 34 : case 40 : case 41 : case 44 : case 58 : case 59 : case 60 : case 62 : case 64 : case 91 : case 92 : case 93 : case 127 : return false ; } return true ; }
docstring: Check if data is an atom.
  
  @param string $chr       The character to check.
  @param string $validate  If in non-validate mode, use these characters
  as the non-atom delimiters.
  
  @return boolean  True if a valid atom.
docstring_tokens: Check if data is an atom .