- Modified json_encode function for PHP < 5.2.0.

Author: falkotimme

interface/lib/classes/functions.inc.php

@@ -111,38 +111,64 @@ public function get_ispconfig_url() {
 
     function json_encode($data) {
 		if(!function_exists('json_encode')){
-			switch ($type = gettype($data)){
-				case 'NULL':
-					return 'null';
-				case 'boolean':
-					return ($data ? 'true' : 'false');
-				case 'integer':
-				case 'double':
-				case 'float':
-					return $data;
-				case 'string':
-					return '"' . addslashes($data) . '"';
-				case 'object':
-					$data = get_object_vars($data);
-				case 'array':
-					$output_index_count = 0;
-					$output_indexed = array();
-					$output_associative = array();
-					foreach($data as $key => $value){
-						$output_indexed[] = $this->json_encode($value);
-						$output_associative[] = $this->json_encode($key) . ':' . $this->json_encode($value);
-						if($output_index_count !== NULL && $output_index_count++ !== $key){
-							$output_index_count = NULL;
-						}
+			if(is_array($data) || is_object($data)){
+				$islist = is_array($data) && (empty($data) || array_keys($data) === range(0,count($data)-1));
+
+				if($islist){
+					$json = '[' . implode(',', array_map(array($this, "json_encode"), $data) ) . ']';
+				} else {
+					$items = Array();
+					foreach( $data as $key => $value ) {
+						$items[] = $this->json_encode("$key") . ':' . $this->json_encode($value);
 					}
-					if($output_index_count !== NULL){
-						return '[' . implode(',', $output_indexed) . ']';
-					} else {
-						return '{' . implode(',', $output_associative) . '}';
+					$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;
 					}
-				default:
-					return ''; // Not supported
+
+					# 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 $json;
 		} else {
 			return json_encode($data);
 		}