finfo_file
finfo::file
(PHP >= 5.3.0, PHP 7, PHP 8, PECL fileinfo >= 0.1.0)
finfo_file -- finfo::file — ファイルについての情報を返す
説明
手続き型
finfo_file(
finfo
string
int
?resource
): string|false
finfo
$finfo,string
$filename,int
$flags = FILEINFO_NONE,?resource
$context = null): string|false
オブジェクト指向型
public finfo::file(string
$filename, int $flags = FILEINFO_NONE, ?resource $context = null): string|falseこの関数は、ファイルについての情報を返すために使用します。
パラメータ
finfo-
finfo_open() が返す、finfo クラスのインスタンス。
filename-
調べるファイルの名前。
flags-
ひとつあるいは複数のFileinfo 定数の組み合わせ。
context-
contextsの説明については、ストリーム 関数 を参照ください。
戻り値
filename のテキスト表現、あるいはエラーが発生した場合に
false を返します。
変更履歴
| バージョン | 説明 |
|---|---|
| 8.1.0 |
引数 finfo は、finfo
クラスのインスタンスを期待するようになりました。
これより前のバージョンでは、リソース を期待していました。
|
| 8.0.0 |
context は、nullable になりました。
|
例
例1 finfo_file() の例
<?php
$finfo = finfo_open(FILEINFO_MIME_TYPE); // mimetype 拡張モジュール風に mime タイプを返します
foreach (glob("*") as $filename) {
echo finfo_file($finfo, $filename) . "\n";
}
finfo_close($finfo);
?>上の例の出力は、 たとえば以下のようになります。
text/html image/gif application/vnd.ms-excel
＋add a note
User Contributed Notes 12 notes
Schraalhans Keukenmeester ¶
17 years ago
Tempting as it may seem to use finfo_file() to validate uploaded image files (Check whether a supposed imagefile really contains an image), the results cannot be trusted. It's not that hard to wrap harmful executable code in a file identified as a GIF for instance.
A better & safer option is to check the result of:
if (!$img = @imagecreatefromgif($uploadedfilename)) {
trigger_error('Not a GIF image!',E_USER_WARNING);
// do necessary stuff
}
66Ton99 at gmail dot com ¶
8 years ago
The way HOWTO get MIME-type of remote file.
<?php
class MimeStreamWrapper
{
const WRAPPER_NAME = 'mime';
public $context;
private static $isRegistered = false;
private $callBackFunction;
private $eof = false;
private $fp;
private $path;
private $fileStat;
private function getStat()
{
if ($fStat = fstat($this->fp)) {
return $fStat;
}
$size = 100;
if ($headers = get_headers($this->path, true)) {
$head = array_change_key_case($headers, CASE_LOWER);
$size = (int)$head['content-length'];
}
$blocks = ceil($size / 512);
return array(
'dev' => 16777220,
'ino' => 15764,
'mode' => 33188,
'nlink' => 1,
'uid' => 10000,
'gid' => 80,
'rdev' => 0,
'size' => $size,
'atime' => 0,
'mtime' => 0,
'ctime' => 0,
'blksize' => 4096,
'blocks' => $blocks,
);
}
public function setPath($path)
{
$this->path = $path;
$this->fp = fopen($this->path, 'rb') or die('Cannot open file: ' . $this->path);
$this->fileStat = $this->getStat();
}
public function read($count) {
return fread($this->fp, $count);
}
public function getStreamPath()
{
return str_replace(array('ftp://', 'http://', 'https://'), self::WRAPPER_NAME . '://', $this->path);
}
public function getContext()
{
if (!self::$isRegistered) {
stream_wrapper_register(self::WRAPPER_NAME, get_class());
self::$isRegistered = true;
}
return stream_context_create(
array(
self::WRAPPER_NAME => array(
'cb' => array($this, 'read'),
'fileStat' => $this->fileStat,
)
)
);
}
public function stream_open($path, $mode, $options, &$opened_path)
{
if (!preg_match('/^r[bt]?$/', $mode) || !$this->context) {
return false;
}
$opt = stream_context_get_options($this->context);
if (!is_array($opt[self::WRAPPER_NAME]) ||
!isset($opt[self::WRAPPER_NAME]['cb']) ||
!is_callable($opt[self::WRAPPER_NAME]['cb'])
) {
return false;
}
$this->callBackFunction = $opt[self::WRAPPER_NAME]['cb'];
$this->fileStat = $opt[self::WRAPPER_NAME]['fileStat'];
return true;
}
public function stream_read($count)
{
if ($this->eof || !$count) {
return '';
}
if (($s = call_user_func($this->callBackFunction, $count)) == '') {
$this->eof = true;
}
return $s;
}
public function stream_eof()
{
return $this->eof;
}
public function stream_stat()
{
return $this->fileStat;
}
public function stream_cast($castAs)
{
$read = null;
$write = null;
$except = null;
return @stream_select($read, $write, $except, $castAs);
}
}
$path = 'http://fc04.deviantart.net/fs71/f/2010/227/4/6/PNG_Test_by_Destron23.png';
echo "File: ", $path, "\n";
$wrapper = new MimeStreamWrapper();
$wrapper->setPath($path);
$fInfo = new finfo(FILEINFO_MIME);
echo "MIME-type: ", $fInfo->file($wrapper->getStreamPath(), FILEINFO_MIME_TYPE, $wrapper->getContext()), "\n";
?>
tim at savaslabs dot com ¶
9 years ago
Just noting (because I ran into it!) that the current implementation of finfo_file has a known bug which causes PHP to allocate huge amounts of memory when certain strings are present in text files that it is examining.
See https://bugs.php.net/bug.php?id=69224 for more info.
contato at vfreitas dot com ¶
12 years ago
Well, i have a great probleam with that, MS Office 2007 extensions (pptx, xlsx, docx) do not have a default Mime type, they have "application/zip" mime type, so, to fix that, i do one little function to verify the extension.
That function allow's you to be safe of fake extensions hack.
<?php
$arrayZips = array("application/zip", "application/x-zip", "application/x-zip-compressed");
$arrayExtensions = array(".pptx", ".docx", ".dotx", ".xlsx");
$file = 'path/to/file.xlsx';
$original_extension = (false === $pos = strrpos($file, '.')) ? '' : substr($file, $pos);
$finfo = new finfo(FILEINFO_MIME);
$type = $finfo->file($file);
if (in_array($type, $arrayZips) && in_array($original_extension, $arrayExtensions))
{
return $original_extension;
}
?>
Zane MegaLab.it ¶
13 years ago
I was getting application/octet-stream or "<= not supported" for all the files.
I found out that in PHP 5.3 the magic file is built-in into PHP and that is what should be used. The magic file found on the system may not always be what libmagic expects, hence the error.
darko at uvcms dot com ¶
16 years ago
Another interresting feature of finfo_file on Windows.
This function can return empty string instead of FALSE for some file types (ppt for example). Therefore to be sure do a triple check of output result and provide default type just in case. Here is a sample code:
$ftype = 'application/octet-stream';
$finfo = @finfo_open(FILEINFO_MIME);
if ($finfo !== FALSE) {
$fres = @finfo_file($finfo, $file);
if ( ($fres !== FALSE)
&& is_string($fres)
&& (strlen($fres)>0)) {
$ftype = $fres;
}
@finfo_close($finfo);
}
niko dot jokipalo at gmail dot com ¶
10 years ago
I spent days looking and searching for a database with actual plain language descriptions for the media types, for example
finfo(.png) --> "image/png" --> "PNG image".
In Ubuntu based OS's you can find already translated database at /usr/share/mime
http://manpages.ubuntu.com/manpages/hardy/en/man5/gnome-mime.5.html
darko at uvcms dot com ¶
16 years ago
OO (bit improved) version of the same thing
<?php
$file = '<somefile>';
$ftype = 'application/octet-stream';
$finfo = @new finfo(FILEINFO_MIME);
$fres = @$finfo->file($file);
if (is_string($fres) && !empty($fres)) {
$ftype = $fres;
}
?>
jesen at protonmail dot com ¶
1 month ago
When using `finfo_file()`, you may encounter results similar to the following, which require attention: `image/png; charset=binary`
scott at thebrain dot ca ¶
15 years ago
I thought to use fileinfo to check if a file was gzip or bzip2. However, the mime type of a compressed file is "data" because compression is an encoding rather than a type.
gzip files begin with binary 1f8b.
bzip2 files begin with magic bytes 'B' 'Z' 'h'.
e.g.
<?php
$s = file_get_contents("somefilepath");
if ( bin2hex(substr($s,0,2)) == '1f8b' ) {/* could be a gzip file */}
if( substr($s,0,3) == 'BZh' ){/* could be a bzip2 file */}
?>
I am not an encoding expert. My only testing was using a few of my own encoded files.
da_kooz at hotmail dot com ¶
11 years ago
Here is an wrapper that will properly identify Microsoft Office 2007 documents. It's trivial and straightforward to use, edit, and to add more file extentions/mimetypes.
<?php
function get_mimetype($filepath) {
if(!preg_match('/\.[^\/\\\\]+$/',$filepath)) {
return finfo_file(finfo_open(FILEINFO_MIME_TYPE), $filepath);
}
switch(strtolower(preg_replace('/^.*\./','',$filepath))) {
// START MS Office 2007 Docs
case 'docx':
return 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
case 'docm':
return 'application/vnd.ms-word.document.macroEnabled.12';
case 'dotx':
return 'application/vnd.openxmlformats-officedocument.wordprocessingml.template';
case 'dotm':
return 'application/vnd.ms-word.template.macroEnabled.12';
case 'xlsx':
return 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
case 'xlsm':
return 'application/vnd.ms-excel.sheet.macroEnabled.12';
case 'xltx':
return 'application/vnd.openxmlformats-officedocument.spreadsheetml.template';
case 'xltm':
return 'application/vnd.ms-excel.template.macroEnabled.12';
case 'xlsb':
return 'application/vnd.ms-excel.sheet.binary.macroEnabled.12';
case 'xlam':
return 'application/vnd.ms-excel.addin.macroEnabled.12';
case 'pptx':
return 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
case 'pptm':
return 'application/vnd.ms-powerpoint.presentation.macroEnabled.12';
case 'ppsx':
return 'application/vnd.openxmlformats-officedocument.presentationml.slideshow';
case 'ppsm':
return 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12';
case 'potx':
return 'application/vnd.openxmlformats-officedocument.presentationml.template';
case 'potm':
return 'application/vnd.ms-powerpoint.template.macroEnabled.12';
case 'ppam':
return 'application/vnd.ms-powerpoint.addin.macroEnabled.12';
case 'sldx':
return 'application/vnd.openxmlformats-officedocument.presentationml.slide';
case 'sldm':
return 'application/vnd.ms-powerpoint.slide.macroEnabled.12';
case 'one':
return 'application/msonenote';
case 'onetoc2':
return 'application/msonenote';
case 'onetmp':
return 'application/msonenote';
case 'onepkg':
return 'application/msonenote';
case 'thmx':
return 'application/vnd.ms-officetheme';
//END MS Office 2007 Docs
}
return finfo_file(finfo_open(FILEINFO_MIME_TYPE), $filepath);
}
?>