WordPress Plugin for accesses the external files(mainly, tag files)
hykwExtFiles::getValue('parent', 'tags', 'googleAnalytics.txt');
---> it retuns the contents in extFiles/tags/googleanalytics.txt
hykwExtFiles::getValue('parent', 'tags', 'foo.txt', ['{{imgPath}}' => '/img']);
---> it retuns the contents from the files, also it replaces the string like below:
<img src="{{imgPath}}/hoge.png"> --> <img src="/img/hoge.png">