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<?php /*** example usage ***/ $filename = 'filename.blah.txt'; /*** get the path info ***/ $info = pathinfo($filename); /*** show the extension ***/ echo $info['extenstion']; //开源代码phpfensi.com ?> //第二种方法也基本相同以上,但使用字符串操作获得延长和争夺点(.)字符也。 <?php /*** example usage ***/ $filename = 'filename.blah.txt'; echo getFileExtension($filename); /** * * @Get File extension from file name * * @param string $filename the name of the file * * @return string * **/ function getFileExtension($filename){ return substr($filename, strrpos($filename, '.')); } ?>