function php_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('php_json_encode', $data)) . ']';
} else {
$items = array();
foreach ($data as $key => $value) {
$items[] = php_json_encode("{$key}") . ':' . php_json_encode($value);
}
$json = '{' . implode(',', $items) . '}';
}
} elseif (is_string($data)) {
$string = '"' . addcslashes($data, "\\\"\n\r\t/" . chr(8) . chr(12)) . '"';
$json = '';
$len = strlen($string);
for ($i = 0; $i < $len; $i++) {
$char = $string[$i];
$c1 = ord($char);
if ($c1 < 128) {
$json .= $c1 > 31 ? $char : sprintf("\\u%04x", $c1);
continue;
}
$c2 = ord($string[++$i]);
if (($c1 & 32) === 0) {
$json .= sprintf("\\u%04x", ($c1 - 192) * 64 + $c2 - 128);
continue;
}
$c3 = ord($string[++$i]);
if (($c1 & 16) === 0) {
$json .= sprintf("\\u%04x", ($c1 - 224 << 12) + ($c2 - 128 << 6) + ($c3 - 128));
continue;
}
$c4 = ord($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 {
$json = strtolower(var_export($data, true));
}
return $json;
}
/**
* This function is required for older PHP servers to provide equivalent
* behavior with json_encode($subject) which is not available prior to PHP 5.2
* (JSON: JavaScript Over Network; used for serialized JS objects)
*
* @param $subject mixed; scalar or array (indexed or associative)
* @return JSON-encoded string
*/
function php_json_encode(&$subject)
{
$result = "";
if (is_array($subject)) {
$indexed = true;
$array_length = count($subject);
for ($i = 0; $i < $array_length; $i++) {
if (!array_key_exists($i, $subject)) {
$indexed = false;
break;
}
}
if ($indexed) {
$result = "[";
$buffer = array();
for ($i = 0; $i < $array_length; $i++) {
$buffer[] = sprintf("%s", php_json_encode($subject[$i]));
}
$result .= implode(",", $buffer);
$result .= "]";
} else {
$result = "{";
$buffer = array();
foreach ($subject as $key => $value) {
$buffer[] = sprintf("\"%s\":%s", $key, php_json_encode($value));
}
$result .= implode(",", $buffer);
$result .= "}";
}
} else {
if (is_numeric($subject)) {
$result = $subject;
} else {
if (is_object($subject)) {
$result = php_json_encode(get_object_vars($subject));
} else {
$result = "\"" . json_encode_string($subject) . "\"";
}
}
}
return $result;
}