ganon.php：调用未定义的函数file_get_dom（）

Question

I'm trying to use ganon.php to parse html content like I do with jQuery but I'm having an error saying:

 Fatal error: Call to undefined function file_get_dom()

I followed all the instructions in the library page here:

I placed the "ganon.php" file in the same folder as my file and then included it by:

include 'ganon.php';