Description
bool 
xdiff_file_diff_binary ( string file1, string file2, string dest )
     xdiff_file_diff_binary() makes binary diff of files
     file1 and file2 and stores
     result in file dest. This function works with both text  
     and binary files. Resulting file is in binary format.
    
Note: 
      Both files will be loaded into memory so ensure that your memory_limit is set high enough.
     
     Returns TRUE on success or FALSE on failure.
    
Example 1. xdiff_file_diff_binary() example 
      The following code makes binary diff of two archives.
      
<?php $old_version = 'my_script_1.0.tgz'; $new_version = 'my_script_1.1.tgz';
  xdiff_file_diff_binary($old_version, $new_version, 'my_script.bdiff'); ?>
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     See also xdiff_string_diff_binary().