finfo_open()
finfo::__construct
(PHP >= 5.3.0, PECL fileinfo >= 0.1.0)
创建一个 fileinfo 资源
说明
过程化风格
finfo_open([int $options= FILEINFO_NONE[,string $magic_file=NULL
]]): resource
面向对象风格(构造器):
NULL
]])本函数打开一个魔数数据库并且返回它的资源。
参数
- $options
一个Fileinfo 常量或多个Fileinfo 常量进行逻辑或运算。
- $magic_file
魔数数据库文件名称,通常是/path/to/magic.mime。如果未指定,则使用MAGIC环境变量。如果未指定此环境变量,则使用 PHP 绑定的魔数数据库。
传入
NULL
或者空字符串,等同于使用默认值。
返回值
(仅适用于过程化风格)如果成功则返回一个表示魔数数据库的资源,或者在失败时返回FALSE
。
注释
Warning在 PHP 5.3.11 和 5.4.1 中预期的魔数数据库格式发生了变动,所以,内置的魔数数据库被更新。如果使用了外部魔数数据库,可能会由于格式不同导致读取失败。同时,一些 mime 类型的文字表示也发生了变化,例如,PHP 文件的 mime 类型由“"PHP script text”变为“PHP script, ASCII text”。
Note:通常来说,使用 PHP 绑定的魔数数据库(设置$magic_file参数为空,不设置MAGIC环境变量)是最好的选择,除非你确实需要一个自定义的魔数数据库。
范例
面向对象风格
<?php $finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic"); // 返回 mime 类型 /* get mime-type for a specific file */ $filename = "/usr/local/something.txt"; echo $finfo->file($filename); ?>
过程化风格
<?php $finfo = finfo_open(FILEINFO_MIME, "/usr/share/misc/magic"); // 返回 mime 类型 if (!$finfo) { echo "Opening fileinfo database failed"; exit(); } /* 获取指定文件的 mime 类型 */ $filename = "/usr/local/something.txt"; echo finfo_file($finfo, $filename); /* 关闭资源 */ finfo_close($finfo); ?>
以上例程会输出:
text/plain; charset=us-ascii
参见
finfo_close()
关闭 fileinfo 资源
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; } ?>
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!
On my Debian squeeze system, the path needed is like : <?php $finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic.mgc"); ?>
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."
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.
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,$file); ?>
Couldn't get finfo to return the mimetype in the way expected so i made a function to do it with system() <?php function get_mime_type($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
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.
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
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 \!