Question

I want to read data from a text file d.txt. Then create 2 new text files,write a even line in a separate file e.txt and odd in another file o.txt.

 <?php
 $evenhandler = fopen("e.txt","w");        
 $oddhandler = fopen("o.txt","w");
 $handle = fopen('d.txt', 'r');
 while (!feof($handle))
   {
      $f=fgets($handle);
   fwrite($evenhandler,$f);
    }
  fclose($file); 

 ?>

Actually I didn,t understand how to implement it and according to my code no output was shown on screen.

Answer 1

<?php
 $evenhandler = fopen("e.txt","w");        
 $oddhandler = fopen("o.txt","w");
 $handle = fopen('d.txt', 'r');
 $i=0;
 while (!feof($handle))
   {
      $f=fgets($handle);
      if($i%2==0)
      {
        fwrite($evenhandler,$f);
      }
      else
      {
        fwrite($oddhandler,$f);
      }
    $i++;
  }
  fclose($handle); 
  fclose($evenhandler); 
  fclose($oddhandler); 
?>

Performance Tip:

You can even further increase its performance (in case your input file is very big) . You can start with value of $i being as 0 and in the loop just check if it is 0 set it to 1 and vice versa. Then for your if you can just check if i = 1 or i =0 to make a decission. This way you can avoid using modulus operator in every pass and still get same result