二进制文件类型判断(无后缀情况)

```php
$image = file_get_contents($url);

echo check_image_type($image);

整理了一些常用文件的头部编码,

这些头部编码可以用UltraEdit或是winhex来能过二进制方式打开文件来查看

从Ultraedit查看的头部编码 
```
JPEG (jpg),文件头:FFD8FF 
PNG (png),文件头:89504E47 
GIF (gif),文件头:47494638 
TIFF (tif),文件头:49492A00 
Windows Bitmap (bmp),文件头:424D

Execute File(.exe .dll .drv .vxd .sys .ocx .vbx)  文件头:4D5A900003 
CAD (dwg),文件头:41433130 
Adobe Photoshop (psd),文件头:38425053 
Rich Text Format (rtf),文件头:7B5C727466 
XML (xml),文件头:3C3F786D6C 
HTML (html),文件头:68746D6C3E 
Email [thorough only] (eml),文件头:44656C69766572792D646174653A 
Outlook Express (dbx),文件头:CFAD12FEC5FD746F 
Outlook (pst),文件头:2142444E 
MS Word/Excel (xls.or.doc),文件头:D0CF11E0 
MS Access (mdb),文件头:5374616E64617264204A 
WordPerfect (wpd),文件头:FF575043 
Postscript (eps.or.ps),文件头:252150532D41646F6265 
Adobe Acrobat (pdf),文件头:255044462D312E 
Quicken (qdf),文件头:AC9EBD8F 
Windows Password (pwl),文件头:E3828596 
ZIP Archive (zip),文件头:504B0304 
RAR Archive (rar),文件头:52617221 
Wave (wav),文件头:57415645 
AVI (avi),文件头:41564920 
Real Audio (ram),文件头:2E7261FD 
Real Media (rm),文件头:2E524D46 
MPEG (mpg),文件头:000001BA 
MPEG (mpg),文件头:000001B3 
Quicktime (mov),文件头:6D6F6F76 
Windows Media (asf),文件头:3026B2758E66CF11 
MIDI (mid),文件头:4D546864 
```

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