(PHP >= 5.3.0, PECL fileinfo >= 0.1.0)
finfo_open -- finfo::__construct — Create a new fileinfo resource
过程化风格
$options = FILEINFO_NONE
[, string $magic_file = NULL
]] )面向对象风格 (constructor):
$options = FILEINFO_NONE
[, string $magic_file = NULL
]] )This function opens a magic database and returns its resource.
options
One or disjunction of more Fileinfo constants.
magic_file
Name of a magic database file, usually something like /path/to/magic.mime. If not specified, the MAGIC environment variable is used. If this variable is not set either, /usr/share/misc/magic is used by default. A .mime and/or .mgc suffix is added if needed.
Passing NULL or an empty string will be equivalent to the default value.
(Procedural style only)
Returns a magic database resource on success 或者在失败时返回 FALSE.
As of PHP >= 5.3.11 and >= 5.4.1 the magic datababase format has changed. Due to this, the internal mime database was upgraded. This affects especially the code where external magic is read in. Reading in magic files of the older formats will not work. Also, some textual representations of the mime types has changed, for instance for PHP would be "PHP script, ASCII text" instead of "PHP script text" returned.
Example #1 面向对象风格
<?php
$finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic"); // return mime type ala mimetype extension
/* get mime-type for a specific file */
$filename = "/usr/local/something.txt";
echo $finfo->file($filename);
?>
Example #2 过程化风格
<?php
$finfo = finfo_open(FILEINFO_MIME, "/usr/share/misc/magic"); // return mime type ala mimetype extension
if (!$finfo) {
echo "Opening fileinfo database failed";
exit();
}
/* get mime-type for a specific file */
$filename = "/usr/local/something.txt";
echo finfo_file($finfo, $filename);
/* close connection */
finfo_close($finfo);
?>
以上例程会输出：
text/plain; charset=us-ascii