为什么我的PHP代码从本地zip文件读取文件内容失败？

Question

I compressed a folder to a zip file using ZipArchive, and the next line of my code, I need to read the zip file created just now. I used file_get_contents, but somehow it crashed, $a = file_get_contents('a.zip'); it will not process to if($a){echo "something";} else {echo "something else"}. It won't echo anything at all.