diff --git a/features/gc.xml b/features/gc.xml
index efad31292f..d63f915b5c 100644
--- a/features/gc.xml
+++ b/features/gc.xml
@@ -30,7 +30,11 @@
     A zval container is created when a new variable is created with a constant
     value, such as:
     <programlisting role="php">
+<![CDATA[
+<?php
 $a = "new string";
+?>
+]]>
     </programlisting>
    </para>
    <para>
@@ -45,7 +49,11 @@ $a = "new string";
    </para>
    <para>
     <programlisting role="php">
+<![CDATA[
+<?php
 xdebug_debug_zval('a');
+?>
+]]>
     </programlisting>
    </para>
    <para>
@@ -61,9 +69,13 @@ a: (refcount=1, is_ref=0)='new string'
    </para>
    <para>
     <programlisting role="php">
+<![CDATA[
+<?php
 $a = "new string";
 $b = $a;
 xdebug_debug_zval( 'a' );
+?>
+]]>
     </programlisting>
    </para>
    <para>
@@ -85,11 +97,15 @@ a: (refcount=2, is_ref=0)='new string'
    </para>
    <para>
     <programlisting role="php">
+<![CDATA[
+<?php
 $a = "new string";
 $c = $b = $a;
 xdebug_debug_zval( 'a' );
 unset( $b, $c );
 xdebug_debug_zval( 'a' );
+?>
+]]>
     </programlisting>
    </para>
    <para>
@@ -117,8 +133,12 @@ a: (refcount=1, is_ref=0)='new string'
     </para>
     <para>
      <programlisting role="php">
+<![CDATA[
+<?php
 $a = array( 'meaning' => 'life', 'number' => 42 );
 xdebug_debug_zval( 'a' );
+?>
+]]>
      </programlisting>
     </para>
     <para>
@@ -148,9 +168,13 @@ a: (refcount=1, is_ref=0)=array (
     </para>
     <para>
      <programlisting role="php">
+<![CDATA[
+<?php
 $a = array( 'meaning' => 'life', 'number' => 42 );
 $a['life'] = $a['meaning'];
 xdebug_debug_zval( 'a' );
+?>
+]]>
      </programlisting>
     </para>
     <para>
@@ -186,10 +210,14 @@ a: (refcount=1, is_ref=0)=array (
     </para>
     <para>
      <programlisting role="php">
+<![CDATA[
+<?php
 $a = array( 'meaning' => 'life', 'number' => 42 );
 $a['life'] = $a['meaning'];
 unset( $a['meaning'], $a['number'] );
 xdebug_debug_zval( 'a' );
+?>
+]]>
      </programlisting>
     </para>
     <para>
@@ -210,9 +238,11 @@ a: (refcount=1, is_ref=0)=array (
     <para>
      <programlisting role="php">
 <![CDATA[
+<?php
 $a = array( 'one' );
 $a[] =& $a;
 xdebug_debug_zval( 'a' );
+?>
 ]]>
      </programlisting>
     </para>
@@ -451,7 +481,8 @@ a: (refcount=2, is_ref=1)=array (
     </para>
     <para>
      <programlisting role="php">
-<![CDATA[<?php
+<![CDATA[
+<?php
 class Foo
 {
     public $var = '3.1415962654';
@@ -468,7 +499,8 @@ for ( $i = 0; $i <= 100000; $i++ )
         echo sprintf( '%8d: ', $i ), memory_get_usage() - $baseMemory, "\n";
     }
 }
-?>]]>
+?>
+]]>
      </programlisting>
     </para>
     <para>
@@ -502,7 +534,8 @@ for ( $i = 0; $i <= 100000; $i++ )
     </para>
     <para>
      <programlisting role="php">
-<![CDATA[<?php
+<![CDATA[
+<?php
 class Foo
 {
     public $var = '3.1415962654';
@@ -515,7 +548,8 @@ for ( $i = 0; $i <= 1000000; $i++ )
 }
 
 echo memory_get_peak_usage(), "\n";
-?>]]>
+?>
+]]>
      </programlisting>
     </para>
     <para>