public static function hget($key, $hkey)
 {
     $data = FileHandler::getFileContent(self::DATA_FILE());
     if (!$data) {
         return false;
     }
     $dataarray = json_decode($data, true);
     if (isset($dataarray[$key][$hkey])) {
         return $dataarray[$key][$hkey];
     } else {
         return false;
     }
 }
<?php

require 'lib.php';
if (!OpenConfig::SAFE_MODE) {
    //@$data = file_get_contents('data.dat');
    $data = FileHandler::getFileContent('data.dat');
} else {
    $data = '{"保密":"根据OpenConfig::SAFE_MODE设置,不展示模拟存储数据"}';
}
header('Content-Type: application/json; charset=UTF-8');
echo $data;