Manual do PHP
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# CXXXIV. xdiff Functions

# Introdução

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

# Dependências

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

> Nota: You'll need at least libxdiff 0.7 for these functions to be aware of memory_limit.

# Instalação

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:

Exemplo 1. xdiff install by hand

    gunzip xdiff-xxx.tgz
    tar -xvf xdiff-xxx.tar
    cd xdiff-xxx
    phpize
    ./configure && make && make install

# Constantes pré-definidas

As contantes abaixo são definidas por esta extensão e somente estarão disponíveis quando a extensão foi compilada com o PHP ou carregada dinamicamente durante a execução.

`XDIFF_PATCH_NORMAL` (integer)

`XDIFF_PATCH_REVERSE` (integer)

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