알짜게시판

[code] <?php function get_filetype($filename) {    $types = [        'jpg' => [0, "\xFF\xD8\xFF"],        'png' => [0, "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A"],        'bmp' => [0, "\x42\x4D"],        'gif' => [0, "\x47\x49\x46\x38"],        'mp4' => [4, "\x66\x74\x79\x70\x69\x73\x6F\x6D"],        'webp' => [8, "\x57\x45\x42\x50"]    ];   $rst = false;   if(is_file($filename) && $hnd = fopen($filename, 'rb'))   {       $buf = fread($hnd, 16);       foreach($types as $type => $patt)       {           if(strcmp($patt[1], substr($buf, $patt[0], strlen($patt[1]))) == 0)           {               $rst = $type;               break;           }       }       fclose($hnd);   }   return $rst; } [/code]