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  <refentry id="function.xdiff-string-diff">
   <refnamediv>
    <refname>xdiff_string_diff</refname>
    <refpurpose>
     Make unified diff of two strings
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>mixed</type><methodname>xdiff_string_diff</methodname>
     <methodparam><type>string</type><parameter>str1</parameter></methodparam>
     <methodparam><type>string</type><parameter>str2</parameter></methodparam>
     <methodparam choice="opt"><type>int</type><parameter>context</parameter></methodparam>
     <methodparam choice="opt"><type>bool</type><parameter>minimal</parameter></methodparam>
    </methodsynopsis>
    <para>
     <function>xdiff_string_diff</function> makes unified diff of strings
     <parameter>str1</parameter> and <parameter>str2</parameter>.
     <parameter>context</parameter> indicated how many lines of context you
     want to include in diff result. Set <parameter>minimal</parameter> to
     &true; if you want to minimalize size of diff (can take a long time).
    </para>
    <note>
     <para>
      This function doesn't work well with binary strings. To make diff of binary
      strings use <function>xdiff_string_diff_binary</function>.
     </para>
    </note>
    <para>
     Returns string with result or &false; if an internal error happened.
    </para>
    <example>
     <title><function>xdiff_string_diff</function> example</title>
     <para>
      The following code makes unified diff of two articles.
     </para>
     <programlisting role="php">
<![CDATA[
<?php
$old_article = file_get_contents('./old_article.txt');
$new_article = $_REQUEST['article']; /* Let's say that someone pasted a new article to html form */

$diff = xdiff_string_diff($old_article, $new_article, 1);
if (is_string($diff)) {
    echo "Differences between two articles:\n";
    echo $diff;
}

?>
]]>
     </programlisting>
    </example>
    <para>
     See also <function>xdiff_file_diff</function>.
    </para>
   </refsect1>
  </refentry>

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