Add example

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@247676 c90b9560-bf6c-de11-be94-00142212c4b1

reference/pcre/functions/preg-last-error.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 <refentry xml:id="function.preg-last-error" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>preg_last_error</refname>
@@ -15,8 +15,32 @@
   <para>
    Returns the error code of the last PCRE regex execution.
   </para>
- </refsect1>
+  <para>
+   <example>
+    <title><function>preg_last_error</function> example</title>
+    <programlisting role="php">
+<![CDATA[
+<?php
 
+preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');
+
+if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
+    print 'Backtrack limit was exhausted!';
+}
+
+?>
+]]>
+    </programlisting>
+    &example.outputs;
+    <screen>
+<![CDATA[
+Backtrack limit was exhausted!
+]]>
+    </screen>
+   </example>
+  </para>
+ </refsect1>
+  
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>