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<refentry xml:id="function.svn-diff" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>svn_diff</refname>
  <refpurpose>Recursively diffs two paths</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>svn_diff</methodname>
   <methodparam><type>string</type><parameter>path1</parameter></methodparam>
   <methodparam><type>int</type><parameter>rev1</parameter></methodparam>
   <methodparam><type>string</type><parameter>path2</parameter></methodparam>
   <methodparam><type>int</type><parameter>rev2</parameter></methodparam>
  </methodsynopsis>
  <para>
   Recursively diffs two paths, <parameter>path1</parameter> and
   <parameter>path2</parameter>.
  </para>
  <note>
   <para>
    This is not a general-purpose diff utility. Only local files
    that are versioned may be diffed: other files will fail.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>path1</parameter></term>
     <listitem>
      <para>
       First path to diff. This can be a URL to a file/directory in an SVN
       repository or a local file/directory path.
      </para>
      &svn.relativepath;
      <warning>
       <simpara>
        If a local file path has only backslashes and no forward slashes,
        this extension will fail to find the path. Always
        replace all backslashes with forward slashes when using this
        function.
       </simpara>
      </warning>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>rev1</parameter></term>
     <listitem>
      <para>
       First path's revision number. Use <constant>SVN_REVISION_HEAD</constant>
       to specify the most recent revision.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>path2</parameter></term>
     <listitem>
      <para>
       Second path to diff. See <parameter>path1</parameter> for description.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>rev2</parameter></term>
     <listitem>
      <para>
       Second path's revision number. See <parameter>rev1</parameter>
       for description.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>

 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array-list consisting of two streams: the first is the diff output
   and the second contains error stream output. The streams can be
   read using <function>fread</function>. Returns &false; or &null; on
   error.
  </para>
  <para>
   The diff output will, by default, be in the form of Subversion's
   custom unified diff format, but an
   <link xlink:href="&url.svn.manual.externaldifftools;">external
   diff engine</link> may be
   used depending on Subversion's configuration.
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &warn.experimental.func;
 </refsect1>

 <!-- Use when ERRORS exist
 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   When does this function throw E_* level errors, or exceptions?
  </para>
 </refsect1>
 -->

 <!-- Use when a CHANGELOG exists
 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>Enter the PHP version of change here</entry>
       <entry>Description of change</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 -->

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Basic example</title>
    <para>
     This example demonstrates the basic usage of this function, and
     the retrieval of contents from the stream:
    </para>
    <programlisting role="php">
<![CDATA[
<?php
list($diff, $errors) = svn_diff(
    'http://www.example.com/svnroot/trunk/foo', SVN_REVISION_HEAD,
    'http://www.example.com/svnroot/branches/dev/foo', SVN_REVISION_HEAD
);
if (!$diff) exit;
$contents = '';
while (!feof($diff)) {
  $contents .= fread($diff, 8192);
}
fclose($diff);
fclose($errors);
var_dump($contents);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Index: http://www.example.com/svnroot/trunk/foo
===================================================================
--- http://www.example.com/svnroot/trunk/foo        (.../foo) (revision 23)
+++ http://www.example.com/svnroot/branches/dev/foo (.../foo) (revision 27)
 // further diff output
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>Diffing two revisions of a repository path</title>
    <para>
     This example implements a wrapper function that allows a user
     to easily diff two revisions of the same item using an external
     repository path (the default syntax is somewhat verbose):
    </para>
    <programlisting role="php">
<![CDATA[
<?php
function svn_diff_same_item($path, $rev1, $rev2) {
    return svn_diff($path, $rev1, $path, $rev2);
}
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Portably diffing two local files</title>
    <para>
     This example implements a wrapper function that portably
     diffs two local files, compensating for the <function>realpath</function>
     fix and the backslashes bug:
    </para>
    <programlisting role="php">
<![CDATA[
<?php
function svn_diff_local($path1, $rev1, $path2, $rev2) {
    $path1 = str_replace('\\', '/', realpath($path1));
    $path2 = str_replace('\\', '/', realpath($path2));
    return svn_diff($path1, $rev1, $path2, $rev2);
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><link xlink:href="&url.svn.manual.diff;">SVN documentation on svn diff</link></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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