How to open and read PHP files have been discussed in previous blog:
http://findnerd.com/list/view/How-to-open-and-read-files-with-PHP/3157/

Now,we will discuss about copying a php file.

In php,we can Copy files from source to destination.
Function used :

copy(used in PHP 4, PHP 5)

It takes two parameters as input:
1. Destination path
2. Source Path

Syntax:

  copy (string $source, string $destination);

NOTE: If the destination file exists it will be overwritten.
It returns true on success and false on failure.

Can be explained with an example:

<?php  
$source_file ='sourcefile.txt';
 $destination_file = 'destination.txt.bak'; 
// Will copy source_file  to destination_file
 // overwritting in destination if necessary
 if (!copy($source_file,
  $destination_file)) {
       echo "failed to copy $file...\n"; } ?>