<?xml version="1.0" encoding="utf-8"?>
<slide>
	<title>Garbage Collections</title>
	<subtitle>Garbage Creation</subtitle>

	<example><![CDATA[$a = array( 'one' );
$a[] =& $a;
unset( $a );]]></example>

<example>(refcount=1, is_ref=1)=array (
        0 => (refcount=1, is_ref=0)='one',
        1 => (refcount=1, is_ref=1)=...
)</example>
	<image align="center" filename="gc-part1-figure4.png" />
</slide>
