Added titles and little introduction to options for php 4 and php 3

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@66632 c90b9560-bf6c-de11-be94-00142212c4b1

chapters/install.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.102 $ -->
+<!-- $Revision: 1.103 $ -->
  <chapter id="installation">
   <title>Installation</title>
 
@@ -689,6 +689,16 @@ $ /usr/local/sbin/php4-enable
  </itemizedlist>
 -->
 
+ <sect2 id="install.configure.options">
+  <title>Configure Options in PHP 4</title>
+ <note>
+  <para>
+   These options are only used in PHP 4 as of PHP 4.1.0. 
+   Some are available in older versions of PHP 4, some even in PHP 3, some only in PHP 4.1.0.
+   If you want to compile an older version, some options will probably 
+   not be available.
+  </para>
+ </note>
   <variablelist>
    <varlistentry id="install.configure.enable-maintainer-mode">
     <term>
@@ -2386,6 +2396,17 @@ $ /usr/local/sbin/php4-enable
      </para>
     </listitem>
    </varlistentry>
+  </variablelist>
+ </sect2>
+ <sect2 id="install.configure.options.php3">
+  <title>Configure Options in PHP 3</title>
+ <note>
+  <para>
+   These options are only valid in PHP 3. They will not work in 
+   PHP 4.
+  </para>
+ </note>
+  <variablelist>
 <!-- Options only available in PHP 3 -->
    <varlistentry id="install.configure.disable-bcmath">
     <term>
@@ -2528,7 +2549,8 @@ $ /usr/local/sbin/php4-enable
    </varlistentry>
 <!-- End options only available in PHP 3 -->
   </variablelist>
-  </sect1>
+ </sect2>
+</sect1>
 
   <sect1 id="install.windows">
    <title>Installation on Windows systems</title>