(PECL xdiff >= 1.5.0) xdiff_file_bdiff_size — Read a size of
file created by applying a binary diff Returns a size of a
result file that would be created after applying binary patch
from file file to the original file. Returns the size of file
that would be created. Example #1 xdiff_file_bdiff_size()
example The following code applies reads a size of file that
would be created after applying a binary diff. $length =
xdiff_string_bdiff_size('file.bdiff'); echo "Resulting file will
be $length bytes long";