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finfo_open

finfo::__construct

(PHP >= 5.3.0, PHP 7, PHP 8, PECL fileinfo >= 0.1.0)

finfo_open -- finfo::__construct — Cria uma instância de finfo

Descrição

Estilo procedural

finfo_open(int $flags = FILEINFO_NONE, ?string $magic_database = null): finfo|false

Estilo orientado a objetos (construtor):

public finfo::__construct(int $flags = FILEINFO_NONE, ?string $magic_database = null)

Esta função abre um banco de dados mágico e retorna a instância.

Parâmetros

flags

Uma ou disjunção de mais constantes Fileinfo.

magic_database

Nome de um arquivo de banco de dados mágico, geralmente algo como /caminho/para/magic.mime. Se não for especificado, a variável de ambiente MAGIC será usada. O banco de dados mágico incluído no PHP será usado se a variável de ambiente não estiver definida.

Passar null ou uma string vazia será equivalente ao valor padrão.

Valor Retornado

(Apenas no estilo procedural) Retorna uma instância de finfo em caso de sucesso, ou false em caso de falha.

Registro de Alterações

Versão	Descrição
8.1.0	Agora retorna uma instância de finfo; anteriormente, um resource era retornado.
8.0.3	O parâmetro `magic_database` agora pode ser nulo.

Exemplos

Exemplo #1 Estilo orientado a objetos

<?php
// retorna o tipo MIME, também conhecido como extensão mimetype
$finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic");

/* Obtém o tipo MIME de arquivo específico */
$nome_do_arquivo = "/usr/local/alguma_coisa.txt";
echo $finfo->file($nome_do_arquivo);

?>

Exemplo #2 Estilo procedural

<?php
// retorna o tipo MIME, também conhecido como extensão mimetype
$finfo = finfo_open(FILEINFO_MIME, "/usr/share/misc/magic");

if (!$finfo) {
    echo "Falha ao abrir banco de dados fileinfo";
    exit();
}

/* Obtém o tipo MIME de arquivo específico */
$nome_do_arquivo = "/usr/local/alguma_coisa.txt";
echo finfo_file($finfo, $nome_do_arquivo);

/* fecha a conexão */
finfo_close($finfo);
?>

O exemplo acima produzirá:

text/plain; charset=us-ascii

Notas

Nota:
Geralmente, usar o banco de dados mágico incluído no PHP (deixando o parâmetro magic_database e as variáveis de ambiente MAGIC indefinidos) é o melhor caminho a seguir, a menos que um banco de dados mágico personalizado seja necessário.

Veja Também

finfo_close() - Fecha uma instância de finfo

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User Contributed Notes 10 notes

down

dario dot borreguero at gmail dot com ¶

16 years ago


Platform: WinXP-SP2, PHP5.2.5, MySQL 5.0, Apache 2.2.8

After reading former notes, I wasn't able to load my magic database: 'magic.mime' file (donwloaded from GnuWin32 project, zipped with the binary files v4.21). I always got an invalid $finfo object or finfo_open(...) returned FALSE.

In order to be able to load the 'magic.mime' file, Fileinfo library (bundled in PHP5.2.5) also requires 'magic' file.

For example:
1. Database:
  c:\php\magic.mime
  c:\php\magic

2. PHP Code:
<?php
  $filname = 'c:\php\php.ini';
  $finfo = new finfo(FILEINFO_MIME, 'c:\php\magic');
  if (!$finfo) return false;
  echo $finfo->file($filename);
?>

For further info see: http://pecl.php.net/bugs/bug.php?id=7555

Pay attention to comments added by 'christophe dot charron dot xul at gmail dot com'

NOTE: Before upgrading to PHP5.2.5, I was working with PHP5.2.1 and it only required 'magic.mime' file.

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illusivefingers at gmail dot com ¶

12 years ago


I am running Windows 7 with Apache.  It took hours to figure out why it was not working.

First, enable the php_fileinfo.dll extension in you php.ini. You'll also need the four magic files that are found in the following library:

http://sourceforge.net/projects/gnuwin32/files/file/4.23/file-4.23-bin.zip/download

An environment variable or a direct path to the file named "magic" is necessary, without any extension.  

Then, make sure that xdebug is either turned off or set the ini error_reporting to not display notices or warnings for the script.

Hope this saves someone a few hours of frustration!

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Anonymous ¶

11 years ago


For most common image files:
<?php
function minimime($fname) {
    $fh=fopen($fname,'rb');
    if ($fh) { 
        $bytes6=fread($fh,6);
        fclose($fh); 
        if ($bytes6===false) return false;
        if (substr($bytes6,0,3)=="\xff\xd8\xff") return 'image/jpeg';
        if ($bytes6=="\x89PNG\x0d\x0a") return 'image/png';
        if ($bytes6=="GIF87a" || $bytes6=="GIF89a") return 'image/gif';
        return 'application/octet-stream';
    }
    return false;
}
?>

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olivier dot berger at it-sudparis dot eu ¶

13 years ago


On my Debian squeeze system, the path needed is like :
<?php 
 $finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic.mgc");
?>

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php at brudaswen dot de ¶

16 years ago


Since it costed me some time to find the needed magic database files for Windows, just a hint:

The last release of the GnuWin32 project with both needed files (magic and magic.mime) currently was "file-4.23".
All releases after 4.23 to 4.25-1 did not contain both needed files.

Hope that helps.

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php at kingsquare dot nl ¶

16 years ago


The current version (1.04) doesnt support a different mime.magic database than the server default.

(the documentation is thus not correct)
Ubuntu default location is '/usr/share/file/magic'. In order for the examples to work all finfo_open()-commands must be issued with the extra location accordingly:
<?php
$file = "/path/to/file.jpg";
$handle = finfo_open(FILEINFO_MIME, '/usr/share/file/magic');
$mime_type = finfo_file($handle,$file);
?>

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ian at createanet dot co dot uk ¶

17 years ago


Couldn't get finfo to return the mimetype in the way expected so i made a function to do it with system()

<?php 
function get_mime_type($filepath) {
    ob_start();
    system("file -i -b {$filepath}");
    $output = ob_get_clean();
    $output = explode("; ",$output);
    if ( is_array($output) ) {
        $output = $output[0];
    }
    return $output;
}
?>

hope it works for other people too

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-1

mark at dynom dot nl ¶

16 years ago


It seems there is quite some inconsistency in distributions and loading of magic files.

On Archlinux, the file is located here:
/usr/share/misc/file/magic.mgc

But this:

<?php
$fi = new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic');
$fi->file('/tmp/fubar.txt');
?>

Actually segfaults, where if I type the full name (including the file extension:)

<?php
$fi = new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic.mgc'); // added ".mgc"
$fi->file('/tmp/fubar.txt');
?>

It works as expected, so I guess something goes wrong with "A .mime and/or .mgc suffix is added if needed."

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-4

tularis at php dot net ¶

17 years ago


On Windows systems people might find that this always returns "application/x-dpkg".
There are 2 ways of solving this problem:
1. Get the mime-magic database file from GnuWin32 at <http://sourceforge.net/projects/gnuwin32/>
2. You can manually "fix" the mime-magic file by editing it and escaping all lines starting with !, thus changing each one to \!

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-8

franssen dot roland at gmail dot com ¶

14 years ago


Notice FileInfo::__construct() has strange behavior in PHP < 5.3.1 when a 2nd parameter is set explicitly, e.g.;

<?php
$fileInfo = new finfo(FILEINFO_MIME, null);
?>

Expected result:
----------------
object(finfo)#2 (0) { }

Actual result:
--------------
Warning: finfo::finfo(): Failed to load magic database at ''. in *** on line ***
object(finfo)#2 (0) { }

See http://bugs.php.net/bug.php?id=51732

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