Initialize $str to make the example less confusing

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@142726 c90b9560-bf6c-de11-be94-00142212c4b1

reference/strings/functions/chr.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
   <refentry id="function.chr">
    <refnamediv>
@@ -20,6 +20,7 @@
       <programlisting role="php">
 <![CDATA[
 <?php
+$str = "The string ends in escape: ";
 $str .= chr(27); /* add an escape character at the end of $str */
 
 /* Often this is more useful */