Find Mime type of file or url using php for all file format

问题

Hi I am looking for best way to find out mime type in php for any local file or url. I have tried mime_content_type function of php but since it is deprecated I am looking for better solution in php for all file format.

mime_content_type — Detect MIME Content-type for a file ***(deprecated)***

I have already tried below function

echo 'welcome';
if (function_exists('finfo_open')) {
    echo 'testing';
    $finfo = finfo_open(FILEINFO_MIME);
    $mimetype = finfo_file($finfo, "http://4images.in/wp-content/uploads/2013/12/Siberian-Tiger-Running-Through-Snow-Tom-Brakefield-Getty-Images-200353826-001.jpg");
    finfo_close($finfo);
    echo $mimetype;
}

Above code is not working for me, I am only seeing welcome for output.I am not sure if I am doing something wrong here.

---

Below code works somehow in my local but it does not work for urls.

$file = './apache_pb2.png';
$file_info = new finfo(FILEINFO_MIME);  // object oriented approach!
$mime_type = $file_info->buffer(file_get_contents($file));  // e.g. gives "image/jpeg"
$mime  = explode(';', $mime_type);
print $mime[0];

Is there some work around which work for both(url and local).what is the best practice to set mime type for all contents (image, video, file etc.) other than mime_content_type function in php.also is it recommended to use the mime_content_type function in php, Is it best practice in php ?

回答1:

Make use of file_info in PHP with FILEINFO_MIME_TYPE flag as the parameter.

[Example taken as it is from PHP Manual]

<?php
$finfo = finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extension
foreach (glob("*") as $filename) {
    echo finfo_file($finfo, $filename) . "\n";
}
finfo_close($finfo);
?>

OUTPUT :

text/html
image/gif
application/vnd.ms-excel

---

EDIT :

You need to enable the extension on your PHP.ini

;extension=php_fileinfo.dll

Remove the semicolon from that line and restart your webserver and you are good to go.
Installation Doc.

回答2:

Found the answer,

To find the extension of the file best way is to use path_info for both local files and url.

$info     = pathinfo($filename);

$basename = $info['basename'];

$ext      = $info['extension'];

create an array for the mime type

$mimeTypes = array("mp4" => "video/mp4");// --> See Example here and Here

//get the mime type for file
$type = isset($this->mime_types[$ext]) ? $this->mime_types[$ext] : "application/octet-stream";

Above code works for both url and local files.

Note :

Those struggling with CDN mp4 video mime type video/mp4 issue - I had made a change in my class.s3.php file -> in mime_type[] array and also cross checked with putObject() function.

Setting of mime type is always done in coding side and not in AWS S3 bucket, We need to use AWS PHP Class file or sdk to do the manipulation in mime type or make the necessary changes in core class file (eg. class.s3.php )

回答3:

$type = image_type_to_mime_type(exif_imagetype($file));

回答4:

After I tried all these solutions above that's what I use:

$command = "file -i {$filename}";

$mimeTypeArr = shell_exec($command);

This command returns the line below:

filename: mime_type

After I have this I explode and get what I need.

$mimeTypeArr = shell_exec($command);

$mimeTypeArr = explode(':', $mimeTypeArr);

$mimeType = trim($mimeTypeArr[1]);

Hope it helps!

来源：https://stackoverflow.com/questions/21906596/find-mime-type-of-file-or-url-using-php-for-all-file-format