Read large data from csv file in php

Question

I am reading csv & checking with mysql that records are present in my table or not in php.

csv has near about 25000 records & when i run my code it display "Service Unavailable" error after 2m 10s (onload: 2m 10s)

here i have added code

// for set memory limit & execution time
ini_set('memory_limit', '512M');
ini_set('max_execution_time', '180');

//function to read csv file
function readCSV($csvFile)
{
    $file_handle = fopen($csvFile, 'r');
    while (!feof($file_handle) ) {

       set_time_limit(60); // you can enable this if you have lot of data

       $line_of_text[] = fgetcsv($file_handle, 1024);
   }
   fclose($file_handle);
   return $line_of_text;
 }

// Set path to CSV file
$csvFile = 'my_records.csv';

$csv = readCSV($csvFile);

for($i=1;$i<count($csv);$i++)
{
   $user_email= $csv[$i][1];

   $qry = "SELECT u.user_id, u.user_email_id FROM tbl_user as u WHERE u.user_email_id = '".$user_email."'";

   $result = @mysql_query($qry) or die("Couldn't execute query:".mysql_error().''.mysql_errno());

   $rec = @mysql_fetch_row($result);

   if($rec)
   {
      echo "Record exist";
   }
   else
   {
      echo "Record not exist"; 
   }
}

Note: I just want to list out records those are not exist in my table.

Please suggest me solution on this...

Answer 1

An excellent method to deal with large files is located at: https://stackoverflow.com/a/5249971/797620

This method is used at http://www.cuddlycactus.com/knownpasswords/ (page has been taken down) to search through 170+ million passwords in just a few milliseconds.