[php]代码库$files = array (

'c:\1.jpg',

'c:\1.png',

'c:\1.gif',

'c:\1.rar',

'c:\1.zip',

'c:\1.exe',

);

foreach ( $files AS $file )

{

$fp = fopen ( $file, "rb" );

$bin = fread ( $fp, 2 ); //只读2字节

fclose ( $fp );

$str_info = @unpack ( "C2chars", $bin );

$type_code = intval ( $str_info['chars1'].$str_info['chars2'] );

$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;

}

echo $file , ' type: ', $file_type, ' code:', $type_code, '

';

}