php练习题

//获取文件或则url的后缀名  方法一function getfiles1($file){$arr = parse_url("$file");$path = $arr['path'];$str = explode(".", $path);return array_pop($str);}$file  = "E:\huiren\statics\js\huiren\back.js";print_r(getfiles1($file));//获取文件或则url的后缀名  方法二function getfiles2($file){$path = explode('.',$file);$suffix = array_pop($path);$su = explode('?',$suffix);return array_shift($su);}$file  = "E:\huiren\statics\js\huiren\back.js";print_r(getfiles2($file));//获取文件或则url的后缀名  方法二function getfiles3($file){$suffix = pathinfo($file,PATHINFO_EXTENSION);$su = explode('?',$suffix);return array_shift($su);}$file  = "E:\huiren\statics\js\huiren\back.js";print_r(getfiles3($file));