title: php parallelprocess or one process after another on filewriting
body: <p>Am exporting data to csv. after 25000 records , memory exhausted.
  Memory limit  increasing is ok.</p>
  
  <p>If i have 100000 rows, can i write it as 4 process.
  write first 25000 rows, then next 25000 then next...</p>
  
  <p>Is this possible in csv export?
  Will this have any advantage? Or this is same exporting whole data?</p>
  
  <p>Any multiple processing or parallel processing have some advantage?</p>