(PECL xdiff >= 0.2.0)
xdiff_file_merge3 — Merge 3 files into one
 Merges three files into one and stores the result in a file dest. 
 The old_file is an original version while new_file1
 and new_file2 are modified versions of an original. 
 
old_filePath to the first file. It acts as "old" file.
new_file1
 Path to the second file. It acts as modified version of old_file.
 
new_file2
 Path to the third file. It acts as modified version of old_file.
 
dest
 Path of the resulting file, containing merged changed from both new_file1 and
 new_file2.
 
 Returns true  if merge was successful, string with rejected chunks if
 it was not or false  if an internal error happened.
 
Example #1 xdiff_file_merge3() example
The following code merges three files into one.
<?php
$old_version = 'original_script.php';
$fix1 = 'script_with_fix1.php';
$fix2 = 'script_with_fix2.php';
$errors = xdiff_file_merge3($old_version, $fix1, $fix2, 'fixed_script.php');
if (is_string($errors)) {
 echo "Rejects:\n";
 echo $errors;
}
?>