CODEWITHSUNDEEP
phpfilecontent-typemime-types
Sonny
Sonny

Reputation: 8326

Determining a Local File's Mime Type (Content-type) With PHP

I am trying to determine a file's mime type. I've tried a few methods, but haven't come up with anything that gives consistent output. I've tried $mime = mime_content_type($file) and $mime = exec('file -bi ' . $file). I am serving up images, CSS, and JavaScript.

Example mime_content_type() output:

Example exec(...) output:

As can be seen here, the results are all over the place.

My PHP version is 5.2.6

SOLUTION (thanks to Jacob)

$mimetypes = array(
    'gif' => 'image/gif',
    'png' => 'image/png',
    'jpg' => 'image/jpg',
    'css' => 'text/css',
    'js' => 'text/javascript',
);
$path_parts = pathinfo($file);
if (array_key_exists($path_parts['extension'], $mimetypes)) {
    $mime = $mimetypes[$path_parts['extension']];
} else {
    $mime = 'application/octet-stream';
}

Upvotes: 3

Views: 4729

Answers (1)

Jacob Relkin
Jacob Relkin

Reputation: 163228

The Fileinfo extension will do the job, if you're on >= 5.30

  • You should try to avoid having to execute commands
  • mime_content_type is deprecated in PHP 5.30

If unfortunately you are on < 5.30, then I would probably just write it myself, it's a lot more reliable than what you're getting from the above functions/commands.

Here's an example:

<?php
$filename = 'FILENAME HERE';
$mimetypes = array('png' => 'image/png', 'jpg' => 'image/jpg', 'css' => 'text/css',
    'js' => 'application/x-javascript'
    // any other extensions that you may be serving      
);

$ext = strtolower(substr($filename, strrpos($filename, '.') + 1, strlen($filename)));
if(array_key_exists($ext, $mimetypes)) {
    $mime = $mimetypes[$ext];
} else {
    echo 'mime type not found';
}

?>

Upvotes: 4

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