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<refentry xml:id="function.xdiff-file-diff" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>xdiff_file_diff</refname>
  <refpurpose>Make unified diff of two files</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>xdiff_file_diff</methodname>
   <methodparam><type>string</type><parameter>old_file</parameter></methodparam>
   <methodparam><type>string</type><parameter>new_file</parameter></methodparam>
   <methodparam><type>string</type><parameter>dest</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>context</parameter><initializer>3</initializer></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>minimal</parameter><initializer>&false;</initializer></methodparam>
  </methodsynopsis>
  <para>
   Makes an unified diff containing differences between <parameter>old_file</parameter> and
   <parameter>new_file</parameter> and stores it in <parameter>dest</parameter> file. The
   resulting file is human-readable. An optional <parameter>context</parameter> parameter
   specifies how many lines of context should be added around each change.
   Setting <parameter>minimal</parameter> parameter to true will result in outputting the shortest
   patch file possible (can take a long time). 
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>old_file</parameter></term>
     <listitem>
      <para>
       Path to the first file. This file acts as "old" file.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>new_file</parameter></term>
     <listitem>
      <para>
       Path to the second file. This file acts as "new" file.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>dest</parameter></term>
     <listitem>
      <para>
       Path of the resulting patch file.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>context</parameter></term>
     <listitem>
      <para>
       Indicates how many lines of context you want to include in diff
       result.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>minimal</parameter></term>
     <listitem>
      <para>
       Set this parameter to &true; if you want to minimalize size of the result
       (can take a long time). 
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>xdiff_file_diff</function> example</title>
    <para>
     The following code makes unified diff of two php files with context length of 2.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$old_version = 'my_script.php';
$new_version = 'my_new_script.php';

xdiff_file_diff($old_version, $new_version, 'my_script.diff', 2);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    This function doesn't work well with binary files. To make diff of binary
    files use <function>xdiff_file_bdiff</function>/<function>xdiff_file_rabdiff</function> function.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>xdiff_file_patch</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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