PhpStorm not showing project files in project view

In case both above solutions do not work, try this following approach:

1. cd to your projects .idea Folder

2. Check if there is a file called project_name.iml. If this is not the case create it and paste the following content to it

   <?xml version="1.0" encoding="UTF-8"?>
   <module type="WEB_MODULE" version="4">
     <component name="NewModuleRootManager">
       <content url="file://$MODULE_DIR$"></content>
     </component>
   </module>
   

3. Then check if there is a file called modules.xml. If this is not the case create it and paste the following content to it (which targets to your previously created project_name.iml)

   <?xml version="1.0" encoding="UTF-8"?>
   <project version="4">
     <component name="ProjectModuleManager">
       <modules>
         <module fileurl="file://$PROJECT_DIR$/.idea/project_name.iml" filepath="$PROJECT_DIR$/.idea/project_name.iml" />
       </modules>
     </component>
   </project>
   

4. Restart PhpStorm