xdiff extension creates and applies patches to both text and binary files.
To use xdiff, you will need libxdiff installed, available
on the libxdiff homepage http://www.xmailserver.org/xdiff-lib.html.
You'll need at least libxdiff 0.7 for these functions to be aware of memory_limit.
xdiff is currently available through PECL
If PEAR is available on your *nix-like
system you can use the pear installer to install the xdiff extension, by the
following command: pear -v install xdiff.
You can always download the tar.gz package and install xdiff by hand:
Example 1. xdiff install by hand
tar -xvf xdiff-xxx.tar
./configure && make && make install
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.