PHP json_encode中文不转码 base64链接访问处理

function json_encodes($str){
		$code = json_encode($str);  
		return preg_replace("#\u([0-9a-f]{4})#ie", "iconv("UCS-2", "UTF-8", pack("H4", "\1"))", $code);  
	}
function safe_b64encode($string) {
		$data = base64_encode($string);
		$data = str_replace(array("+","/","="),array("-","_",""),$data);
		return $data;
	}
	//解析特殊字符
	function safe_b64decode($string) {
		$data = str_replace(array("-","_"),array("+","/"),$string);
		$mod4 = strlen($data)%4;
		if ($mod4) {
			$data .= substr("====", $mod4);
		}
		return base64_decode($data);
	}