Fix incorrect function name and description for xdiff_string_rabdiff() (#4996)

Author: lacatoire

reference/xdiff/functions/xdiff-string-rabdiff.xml

@@ -1,29 +1,34 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- Generated by xml_proto.php v2.0. Found in /scripts directory of phpdoc. -->
 <refentry xml:id="function.xdiff-string-rabdiff" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
   <refname>xdiff_string_rabdiff</refname>
-  <refpurpose>Make binary diff of two strings using the Rabin's polynomial fingerprinting algorithm</refpurpose>
+  <refpurpose>
+   Make a binary diff of two strings using the Rabin's polynomial fingerprinting algorithm
+  </refpurpose>
  </refnamediv>
- 
+
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>string</type><methodname>xdiff_string_bdiff</methodname>
+   <type>string|false</type><methodname>xdiff_string_rabdiff</methodname>
    <methodparam><type>string</type><parameter>old_data</parameter></methodparam>
    <methodparam><type>string</type><parameter>new_data</parameter></methodparam>
   </methodsynopsis>
   <para>
-   Makes a binary diff of two strings and returns the result.
-   The difference between this function and <function>xdiff_string_bdiff</function> is different
-   algorithm used which should result in faster execution and smaller diff produced.
-   This function works with both text and binary data. Resulting patch
-   can be later applied using <function>xdiff_string_bpatch</function>/<function>xdiff_file_bpatch</function>.
+   Makes a binary diff of two strings using the Rabin's polynomial fingerprinting algorithm implemented by
+   <link xlink:href="&url.xdiff;">libxdiff</link>. Compared to
+   <function>xdiff_string_bdiff</function>, this algorithm generally produces smaller diffs and operates faster,
+   while remaining fully compatible with <function>xdiff_string_bpatch</function> and
+   <function>xdiff_file_bpatch</function> for applying patches.
+  </para>
+  <para>
+   This function can be used with both text and binary data. The resulting diff data can later be
+   applied to recreate the new version from the old one.
   </para>
   <para>
-   For more details about differences between algorithm used please check <link xlink:href="&url.xdiff;">libxdiff</link> 
-   website.
+   For further information about the algorithm, see the
+   <link xlink:href="https://www.xmailserver.org/xdiff-lib.html">libxdiff documentation</link>.
   </para>
  </refsect1>
 
@@ -35,15 +40,15 @@
      <term><parameter>old_data</parameter></term>
      <listitem>
       <para>
-       First string with binary data. It acts as "old" data.
+       The first string containing the "old" binary data.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><parameter>new_data</parameter></term>
      <listitem>
       <para>
-       Second string with binary data. It acts as "new" data.
+       The second string containing the "new" binary data.
       </para>
      </listitem>
     </varlistentry>
@@ -54,22 +59,42 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   Returns string with binary diff containing differences between "old" and "new"
-   data or &false; if an internal error occurred.
+   Returns a binary diff string containing the differences between the old and new data,&return.falseforfailure;.
+  </para>
+ </refsect1>
+
+ <refsect1 role="examples">
+  &reftitle.examples;
+  <para>
+   <example>
+    <title>Creation of a binary diff between two strings</title>
+    <programlisting role="php">
+     <![CDATA[
+<?php
+$old = file_get_contents('file_v1.txt');
+$new = file_get_contents('file_v2.txt');
+
+$diff = xdiff_string_rabdiff($old, $new);
+file_put_contents('patch.rdiff', $diff);
+?>
+]]>
+    </programlisting>
+   </example>
   </para>
  </refsect1>
 
  <refsect1 role="seealso">
   &reftitle.seealso;
   <para>
    <simplelist>
+    <member><function>xdiff_string_bdiff</function></member>
     <member><function>xdiff_string_bpatch</function></member>
+    <member><function>xdiff_file_bpatch</function></member>
    </simplelist>
   </para>
  </refsect1>
 
 </refentry>
-
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