Split a text file into 2 equal portions

[scifind]

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I have a large text file that i wish to process with PHP.
It makes the server generate a 500 error, but if I manually cut the file down to size the script works, is there an easy way for changing:

file.txt
to
file_1.txt and
file_2.txt

where file_1 and file_2 have equal line counts.

Thanks

[dmorison]

The following PHP should be able to do it; but there may be a catch 22 if the timeout is a file access issue rather than being related to the processing that you are doing. PHP will need write access to the current directory.

<?php
  $source = "file.txt";
  $destination1 = "file_1.txt";
  $destination2 = "file_1.txt";

  // count the number of lines in $source
  $lines = 0;
  $fs = fopen($source,"r");
  while(!feof($fs))
  {
    fgets($fs,1024);
    $lines++;
  }

  // divide $count by 2 to get the halfway point
  $count = intval($count / 2);

  // rewind $source and open $destination1 & 2 for writing
  rewind($fs);

  $fd1 = fopen($destination1,"w");
  $fd2 = fopen($destination2,"w");

  $progress = 0;
  
  while(!feof($fs))
  {
     $line = fgets($fs,1024);
     $progress++;
     if ($progress < $count)
     {
        fwrite($fd1,$line);
     }
     else
     {
        fwrite($fd2,$line);
     }
  }

  fclose($fs);
  fclose($fd1);
  fclose($fd2);
?>

[eskimo]

nice script, but is this line correct?

// divide $count by 2 to get the halfway point
$count = intval($count / 2);

shouldn't it be

// divide $count by 2 to get the halfway point
$count = intval($lines / 2);

probably just me.

[dmorison]

No, it's not just you, it's a bug...