PHP implementation JSON

<?PHPfunction__json_encode ($data ) {                  if(Is_array($data) ||Is_object($data) ) {           $islist=Is_array($data) && (Emptyempty ($data) ||Array_keys($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]; $c 1=Ord($char); #Single byte;             if($c 1<128 ) {                   $json.= ($c 1> 31)?$char:sprintf("\\u%04x",$c 1); Continue; }                   #Double byte            $c 2=Ord($string[++$i]); if( ($c 1& 32) = = = 0) {Reprint Please indicate the source, Zhiyong's personal blog! $json.=sprintf("\\u%04x", ($c 1–192) * 64 +$c 2–128); Continue; }                   #Triple            $c 3=Ord($string[++$i]); if( ($c 1& 16) = = = 0 ) {                   $json.=sprintf("\\u%04x", ($c 1–224) <<12) + (($c 2–128) << 6) + ($c 3–128)); Continue; }                   #Quadruple            $c 4=Ord($string[++$i]); if( ($c 1& 8) = = = 0 ) {                   $u= (($c 1&) << 2) + (($c 2&GT;&GT;4) & 3) –1; $w 1= (54<<10) + ($u&LT;&LT;6) + (($c 2&) << 2) + (($c 3&GT;&GT;4) & 3); $w 2= (55<<10) + (($c 3& <<6) + ($c 4-128); $json.=sprintf("\\u%04x\\u%04x",$w 1,$w 2); }           }       } Else {           #int, floats, bools, null        $json=Strtolower(Var_export($data,true )); }       return $json; }   ?>

PHP implementation JSON