php - Getting a list of files by folder on Drive SDK -

I am trying to create a web UI for navigating my Google Drive for the user and to refer to a Or more documents, I am currently making a web interface using PHP, in a website with a DB.

The problem I am facing is that I can not do a single task to get the list of files through Folder ID.

I tried:

  $ service-> children-> children's children ($ rootfolder id)   
 one ?? | But this will only give the file reference ID file in the folder (the so-called children's resource items), which means that I have to loop through those files and call for each of them to get all the metadata required for all of my YouTube Have to make.  
 Unfortunately ..  
  $ service-> file-> List ()   
 .. My folder will not list my files with any filtering options.  
 I would like to know that Drive with a single call is an effective way to remove the folder file list on the server  
 Thank you very much for your help   < P> 
 
 It is possible to use the drive. Files.list Endpoint A list of files related to a specific folder.  
 To do this, you ? Q can use =  as the query parameter:  
  get https://www.googleapis.com/drive/v2/files?q="'< ; FOLDER_ID & gt; In PHP, which  
  $ service-> file- & gt; list (array ('q' = & gt; in "parent"   
 '& lt; FOLDER_ID' in 'Parent'));