function json_encode( $data ) {
     if( is_array($data) || is_object($data) ) {
         $islist = is_array($data) && ( empty($data) || array_keys($data) === range(0,count($data)-1) );

         if( $islist ) {
             $json = '[' . implode(',', array_map('__json_encode', $data) ) . ']';
         } else {
             $items = Array();
             foreach( $data as $key => $value ) {
                 $items[] = __json_encode("$key") . ':' . __json_encode($value);
             }
             $json = '{' . implode(',', $items) . '}';
         }
     } elseif( is_string($data) ) {
         # Escape non-printable or Non-ASCII characters.
         # I also put the \\ character first, as suggested in comments on the 'addclashes' page.
         $string = '"' . addcslashes($data, "\\\"\n\r\t/" . chr(8) . chr(12)) . '"';
         $json    = '';
         $len    = strlen($string);
         # Convert UTF-8 to Hexadecimal Codepoints.
         for( $i = 0; $i < $len; $i++ ) {

             $char = $string[$i];
             $c1 = ord($char);

             # Single byte;
             if( $c1 <128 ) {
                 $json .= ($c1 > 31) ? $char : sprintf("\\u%04x", $c1);
                 continue;
             }

             # Double byte
             $c2 = ord($string[++$i]);
             if ( ($c1 & 32) === 0 ) {
                 $json .= sprintf("\\u%04x", ($c1 - 192) * 64 + $c2 - 128);
                 continue;
             }

             # Triple
             $c3 = ord($string[++$i]);
             if( ($c1 & 16) === 0 ) {
                 $json .= sprintf("\\u%04x", (($c1 - 224) <<12) + (($c2 - 128) << 6) + ($c3 - 128));
                 continue;
             }

             # Quadruple
             $c4 = ord($string[++$i]);
             if( ($c1 & 8 ) === 0 ) {
                 $u = (($c1 & 15) << 2) + (($c2>>4) & 3) - 1;

                 $w1 = (54<<10) + ($u<<6) + (($c2 & 15) << 2) + (($c3>>4) & 3);
                 $w2 = (55<<10) + (($c3 & 15)<<6) + ($c4-128);
                 $json .= sprintf("\\u%04x\\u%04x", $w1, $w2);
             }
         }
     } else {
         # int, floats, bools, null
         $json = strtolower(var_export( $data, true ));
     }
     return $json;
 }