title: PHP, CSV columns into separate arrays
body: <p>Basically, i want to make a system where a user can upload a CSV file and pick what columns they want to upload/process</p>
  
  <p>I can do this fine by using fopen and foreach,
  but since the number of the column may vary from CSV to CSV....</p>
  
  <p>i can store the picked columns in an array, eg picked[]= "1,2,4";   //from 1,2,3,4 columns
  comma separated or anyway i want.</p>
  
  <p>but how can i use something like list(1,2,4) = explode("," , theData[]);</p>
  
  <p>where i can load 1,2,4, in there dynamically, or even 1,2,3,4 and then i can ignore 3.</p>