the Mittineague Blog

Although SimplePie version 1.1.3 has more problems besides the is_a errors, (hints: "by reference", "static"), this file contains 4 occurrences of is_a

class SimplePie
.....
	function set_file(&$file)
.....
//		if (is_a($file, 'SimplePie_File'))
		$class_name = 'SimplePie_File';
		if ( ( get_class($file) == $class_name )
		 || is_subclass_of($file, $class_name) )
.....
	function init()
.....
//		if (is_a($this->file, 'SimplePie_File') && $this->file->url == $this->feed_url)
		$class_name = 'SimplePie_File';
		if ( ( ( get_class($this->file) == $class_name )
		 || is_subclass_of($this->file, $class_name) )
		 && $this->file->url == $this->feed_url)
.....
	function merge_items($urls, $start = 0, $end = 0, $limit = 0)
.....
//		if (is_a($arg, 'SimplePie'))
		$class_name = 'SimplePie_File';
		if ( ( get_class($arg) == $class_name )
		 || is_subclass_of($arg, $class_name) )
.....
class SimplePie_Cache_File
.....
	function save($data)
.....
//		if (is_a($data, 'SimplePie'))
		$class_name = 'SimplePie_File';
		if ( ( get_class($data) == $class_name )
		 || is_subclass_of($data, $class_name) )