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# CXXII.xdiff Functions

# 介紹

xdiff extension creates and applies patches to both text and binary files.

# 需求

To use xdiff, you will need libxdiff installed, available on the libxdiff homepage http://www.xmailserver.org/xdiff-lib.html.

# 安裝

xdiff is currently available through PECL http://pecl.php.net/package/xdiff.

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:

示範 1.xdiff install by hand
    gunzip xdiff-xxx.tgz
    tar -xvf xdiff-xxx.tar
    cd xdiff-xxx
    phpize
    ./configure && make && make install

# 預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

`XDIFF_PATCH_NORMAL` (integer)

`XDIFF_PATCH_REVERSE` (integer)

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