php获取url字符串截取路径的文件名和扩展名

<?php
//获取连接里边的id
$url = 'http://www.rong123.com/cjbkscbsd/x_dfsdfs/24454_1_1.html';
function getIdByUrl($url) {
	$id = '';
	$filename = basename($url,".html");
	$id = str_replace('-', '_', $filename); 
	if(strstr($id, '_')) {
		$conids = explode('_', $id); 
		$id = $conids[0];
	}
	return $id;
}
echo getIdByUrl($url).'<hr/>';

//获取完整文件名
echo basename($url).'<hr/>';

//获取没有后缀的文件名
echo basename($url,".html");

?>