Read large data from csv file in php [duplicate]

Answer 1

Normally, "Service Unavailable" error will come when 500 error occurs. I think this is coming because of insufficient execution time. Please check your log/browser console, may be you can see 500 error.

First of all, Keep set_time_limit(60) out of loop.

Do some changes like,

1. Apply INDEX on user_email_id column, so you can get the rows faster with your select query.
2. Do not echo message, Keep the output buffer free.

And

I have done these kind of take using Open source program. You can get it here http://sourceforge.net/projects/phpexcelreader/

Try this.