/system/helper/json.php

<?php

if (!function_exists('json_encode')) {

	function json_encode($data) {

		switch (gettype($data)) {

			case 'boolean':

				return $data ? 'true' : 'false';

			case 'integer':

			case 'double':

				return $data;

			case 'resource':

			case 'string':

				# Escape non-printable or Non-ASCII characters. 

				# I also put the \\ character first, as suggested in comments on the 'addclashes' page. 

				$json = ''; 

				

				$string = '"' . addcslashes($data, "\\\"\n\r\t/" . chr(8) . chr(12)) . '"'; 

				

				# Convert UTF-8 to Hexadecimal Codepoints. 

				for ($i = 0; $i < strlen($string); $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); 

					} 

				} 				

			

				return $json;

			case 'array':

				if (empty($data) || array_keys($data) === range(0, sizeof($data) - 1)) {

					$output = array();

					

					foreach ($data as $value) {

						$output[] = json_encode($value);

					}

					

					return '[' . implode(',', $output) . ']';

				}

			case 'object':

				$output = array();

				

				foreach ($data as $key => $value) {

					$output[] = json_encode(strval($key)) . ':' . json_encode($value);

				}

				

				return '{' . implode(',', $output) . '}';

			default:

				return 'null';

		}

	}

}



if (!function_exists('json_decode')) {	

	function json_decode($json, $assoc = false) {

		$match = '/".*?(?<!\\\\)"/';



		$string = preg_replace($match, '', $json);

		$string = preg_replace('/[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/', '', $string);



		if ($string != '') {

			return null;

		}



		$s2m = array();

		$m2s = array();



		preg_match_all($match, $json, $m);

		

		foreach ($m[0] as $s) {

			$hash = '"' . md5($s) . '"';

			$s2m[$s] = $hash;

			$m2s[$hash] = str_replace('$', '\$', $s);

		}



		$json = strtr($json, $s2m);



		$a = ($assoc) ? '' : '(object) ';

		

		$data = array(

			':' => '=>', 

			'[' => 'array(', 

			'{' => "{$a}array(", 

			']' => ')', 

			'}' => ')'

		);

		

		$json = strtr($json, $data);



		$json = preg_replace('~([\s\(,>])(-?)0~', '$1$2', $json);



		$json = strtr($json, $m2s);



		$function = @create_function('', "return {$json};");

		$return = ($function) ? $function() : null;



		unset($s2m); 

		unset($m2s); 

		unset($function);



		return $return;

	}

}

?>