original_string: public function DKIM_QP($txt)
      {
          $line = '';
          $len = strlen($txt);
          for ($i = 0; $i < $len; ++$i) {
              $ord = ord($txt[$i]);
              if (((0x21 <= $ord) and ($ord <= 0x3A)) or $ord == 0x3C or ((0x3E <= $ord) and ($ord <= 0x7E))) {
                  $line .= $txt[$i];
              } else {
                  $line .= '=' . sprintf('%02X', $ord);
              }
          }
  
          return $line;
      }
code: public function DKIM_QP($txt)
      {
          $line = '';
          $len = strlen($txt);
          for ($i = 0; $i < $len; ++$i) {
              $ord = ord($txt[$i]);
              if (((0x21 <= $ord) and ($ord <= 0x3A)) or $ord == 0x3C or ((0x3E <= $ord) and ($ord <= 0x7E))) {
                  $line .= $txt[$i];
              } else {
                  $line .= '=' . sprintf('%02X', $ord);
              }
          }
  
          return $line;
      }
code_tokens: public function DKIM_QP ( $ txt ) { $ line = '' ; $ len = strlen ( $ txt ) ; for ( $ i = 0 ; $ i < $ len ; ++ $ i ) { $ ord = ord ( $ txt [ $ i ] ) ; if ( ( ( 0x21 <= $ ord ) and ( $ ord <= 0x3A ) ) or $ ord == 0x3C or ( ( 0x3E <= $ ord ) and ( $ ord <= 0x7E ) ) ) { $ line .= $ txt [ $ i ] ; } else { $ line .= '=' . sprintf ( '%02X' , $ ord ) ; } } return $ line ; }
docstring: Quoted-Printable-encode a DKIM header.
  
  @param string $txt
  
  @return string
docstring_tokens: Quoted - Printable - encode a DKIM header .