public function EncodeQPphp( $input = '', $line_max = 76, $space_conv = false) {
    $hex = array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');
    $lines = preg_split('/(?:\r\n|\r|\n)/', $input);
    $eol = "\r\n";
    $escape = '=';
    $output = '';
    while( list(, $line) = each($lines) ) {
      $linlen = strlen($line);
      $newline = '';
      for($i = 0; $i < $linlen; $i++) {
        $c = substr( $line, $i, 1 );
        $dec = ord( $c );
        if ( ( $i == 0 ) && ( $dec == 46 ) ) { // convert first point in the line into =2E
          $c = '=2E';
        }
        if ( $dec == 32 ) {
          if ( $i == ( $linlen - 1 ) ) { // convert space at eol only
            $c = '=20';
          } else if ( $space_conv ) {
            $c = '=20';
          }
        } elseif ( ($dec == 61) || ($dec < 32 ) || ($dec > 126) ) { // always encode "\t", which is *not* required
          $h2 = floor($dec/16);
          $h1 = floor($dec%16);
          $c = $escape.$hex[$h2].$hex[$h1];
        }
        if ( (strlen($newline) + strlen($c)) >= $line_max ) { // CRLF is not counted
          $output .= $newline.$escape.$eol; //  soft line break; " =\r\n" is okay
          $newline = '';
          // check if newline first character will be point or not
          if ( $dec == 46 ) {
            $c = '=2E';
          }
        }
        $newline .= $c;
      } // end of for
      $output .= $newline.$eol;
    } // end of while
    return $output;
  }