解决PHP5.4版本以下json_encode转义中文的情况

function json_encode_ex($var) {
if ($var === null)
return 'null';

if ($var === true)
return 'true';
if ($var === false)
return 'false';
static $reps = array(
array("\\", "/", "\n", "\t", "\r", "\b", "\f", '"', ),
array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"', ),
);
if (is_scalar($var))
return '"' . str_replace($reps[0], $reps[1], (string) $var) . '"';
if (!is_array($var))
throw new Exception('JSON encoder error!');
$isMap = false;
$i = 0;
foreach (array_keys($var) as $k) {
if (!is_int($k) || $i++ != $k) {
$isMap = true;
break;
}
}
$s = array();
if ($isMap) {
foreach ($var as $k => $v)
$s[] = '"' . $k . '":' . call_user_func(__FUNCTION__, $v);
return '{' . implode(',', $s) . '}';
} else {
foreach ($var as $v)
$s[] = call_user_func(__FUNCTION__, $v);
return '[' . implode(',', $s) . ']';
}
}