不通过扩展名，去判断文件类型 

 1 第一种方法
 2 
 3 通过php的finfo_file()
 4 
 5 $handle=finfo_open(FILEINFO_MIME_TYPE);//This function opens a magic database and returns its resource. 
 6 $fileInfo=finfo_file($handle,'./test.txt');// Return information about a file
 7 finfo_close($handle);
 8 print_r($fileInfo);
 9 echo '==========="\n"';
10 
11 另外
12 finfo_buffer: Return information about a string buffer
13 finfo_close: Close fileinfo resource
14 mime_content_type:Detect MIME Content-type for a file (deprecated)
15 
16 第二种方法
17 
18 通过二进制流获取文件内容
19 
20 $fp=fopen('test.txt','r')///实际是image/png
21 $bin = fread($fp, 2); //只读2字节
22 fclose($fp);
23 $str_info  = @unpack(“C2chars”, $bin);//Unpack data from binary string
24 $type_code = intval($str_info['chars1'].$str_info['chars2']);// Get the integer value of a variable
25 $file_type = ”;
26 switch ($type_code) {
27 case 7790:
28 $file_type = ‘exe’;
29 break;
30 case 7784:
31 $file_type = ‘midi’;
32 break;
33 case 8075:
34 $file_type = ‘zip’;
35 break;
36 case 8297:
37 $file_type = ‘rar’;
38 break;
39 case 255216:
40 $file_type = ‘jpg’;
41 break;
42 case 7173:
43 $file_type = ‘gif’;
44 break;
45 case 6677:
46 $file_type = ‘bmp’;
47 break;
48 case 13780:
49 $file_type = ‘png’;
50 break;
51 default:
52 $file_type = ‘unknown’;
53 break;
54 }

 

posted @ 2013-07-22 10:27  尹少爷  阅读(498)  评论(0)    收藏  举报