php使用pathinfo方法获取文件路径信息

有路径如下：upload/2016-01-10/aaaa.pdf

使用pathinfo方法可以获得路径、文件名、扩展名：

$url1 = 'upload/2016-01-01/aaaa.pdf';
$path = pathinfo($url1, PATHINFO_DIRNAME );// upload/2016-01-01
$filename =  pathinfo($url1, PATHINFO_BASENAME );// aaa.tpdf
$exten = pathinfo($url1, PATHINFO_EXTENSION);// pdf