php 获取文件后缀

 ?/** ????* 获取文件后缀
　　 ?* $path 本地存储临时文件路径 ????* */ ???private function getFileType($path){ ???????$fp=fopen($path,‘r‘); ???????$bin = fread($fp, 2); //只读2字节 ???????fclose($fp); ???????$str_info = @unpack(‘C2chars‘, $bin);//Unpack data from binary string ???????$type_code = intval($str_info[‘chars1‘].$str_info[‘chars2‘]);// Get the integer value of a variable ???????$file_type =‘‘; ???????switch ($type_code) { ???????????case 7790: ???????????????$file_type = ‘exe‘; ???????????????break; ???????????case 7784: ???????????????$file_type = ‘midi‘; ???????????????break; ???????????case 8075: ???????????????$file_type = ‘zip‘; ???????????????break; ???????????case 8297: ???????????????$file_type = ‘rar‘; ???????????????break; ???????????case 255216: ???????????????$file_type = ‘jpg‘; ???????????????break; ???????????case 7173: ???????????????$file_type = ‘gif‘; ???????????????break; ???????????case 6677: ???????????????$file_type = ‘bmp‘; ???????????????break; ???????????case 13780: ???????????????$file_type = ‘png‘; ???????????????break; ???????????default: ???????????????$file_type = ‘unknown‘; ???????????????break; ???????} ???????return $file_type; ???}