在網(wǎng)絡開發(fā)中經(jīng)常需要用戶上傳文件，一般的做法都是驗證用戶上傳文件的后綴名是不是在自己限定的范圍內(nèi)，比如jpg,png.這種方式有個bug就是用戶可以自己修改用戶名，比如把一個1.txt文件改成1.png文件上傳，這樣上傳的文件就不是我們需要的，所以在服務端還要在判斷下文件的mimie

這時候就需要用到這兩個函數(shù)finfo_open()和finfo_file,php5.3以后需要打開extension=php_fileinfo.dll

直接擼代碼：

?function checkTpe($type,$filepath){

if(!file_exists($filepath)){

return false;

}

$extensions = [

'image/bmp' => 'bmp',

'image/x-ms-bmp' => 'bmp',

'image/cgm' => 'cgm',

'image/g3fax' => 'g3',

'image/gif' => 'gif',

'image/ief' => 'ief',

'image/jpeg' => 'jpeg',

'image/pjpeg' => 'jpeg',

'image/ktx' => 'ktx',

'image/png' => 'png',

'image/prs.btif' => 'btif',

'image/sgi' => 'sgi',

'image/svg+xml' => 'svg',

'image/tiff' => 'tiff',

'image/vnd.adobe.photoshop' => 'psd',

'image/vnd.dece.graphic' => 'uvi',

'image/vnd.dvb.subtitle' => 'sub',

'image/vnd.djvu' => 'djvu',

'image/vnd.dwg' => 'dwg',

'image/vnd.dxf' => 'dxf',

'image/vnd.fastbidsheet' => 'fbs',

'image/vnd.fpx' => 'fpx',

'image/vnd.fst' => 'fst',

'image/vnd.fujixerox.edmics-mmr' => 'mmr',

'image/vnd.fujixerox.edmics-rlc' => 'rlc',

'image/vnd.ms-modi' => 'mdi',

'image/vnd.ms-photo' => 'wdp',

'image/vnd.net-fpx' => 'npx',

'image/vnd.wap.wbmp' => 'wbmp',

'image/vnd.xiff' => 'xif',

'image/webp' => 'webp',

'image/x-3ds' => '3ds',

'image/x-cmu-raster' => 'ras',

'image/x-cmx' => 'cmx',

'image/x-freehand' => 'fh',

'image/x-icon' => 'ico',

'image/x-mrsid-image' => 'sid',

'image/x-pcx' => 'pcx',

'image/x-pict' => 'pic',

'image/x-portable-anymap' => 'pnm',

'image/x-portable-bitmap' => 'pbm',

'image/x-portable-graymap' => 'pgm',

'image/x-portable-pixmap' => 'ppm',

'image/x-rgb' => 'rgb',

'image/x-tga' => 'tga',

'image/x-xbitmap' => 'xbm',

'image/x-xpixmap' => 'xpm',

'image/x-xwindowdump' => 'xwd'

];

$fg = finfo_open(FILEINFO_MIME_TYPE);

$mime = finfo_file($fg,$filepath);

finfo_close($fg);

if($extensions[$mime] && $extensions[$mime]==$type){

return true;

}

return false;

}