CODEWITHSUNDEEP
phpmime-types
David M
David M

Reputation: 13

How can I detect the mime type with PHP when an actual file doesn't exist?

Is there a way to detect the mime type of a file without actually having an actual file, for example when you're generating the file and serving it as a download?

I'm currently using file extension sniffing from here: http://www.php.net/manual/en/function.mime-content-type.php#87856

I was just wondering if there was another way short of actually creating the file on the server and using FileInfo, mime_content_type(), or file

Upvotes: 1

Views: 1114

Answers (5)

Rachid Loukili
Rachid Loukili

Reputation: 845

you can check this :

 $filename = 'image.jpg'; 
 $filename2 = 'file.php'; 
 echo mime_content_type($filename) . "<br>";
 echo mime_content_type($filename2);

Upvotes: 0

Ben
Ben

Reputation: 57287

If you know the type of file you're generating, just consult an array of known mime types and apply as appropriate.

Upvotes: 0

user7675
user7675

Reputation:

Try the Fileinfo finfo_buffer() function:

$filename = 'image.jpg';
$contents = file_get_contents($filename);

$finfo = finfo_open(FILEINFO_MIME_TYPE);
var_dump( finfo_buffer($finfo, $contents) ); // string(10) "image/jpeg"

You do say "short of actually creating the file," so this seems to meet your requirements even though it uses Fileinfo.

Upvotes: 2

recluze
recluze

Reputation: 1915

You might want to pipe it as such: 

 $type = `echo $FILE_CONTENTS | file -bi -`

READ: This is a bad idea. Do not do this. 'Command line injection' (thanks to Andrew Moore for point this out.)

Upvotes: 0

tobyodavies
tobyodavies

Reputation: 28099

Have you tried writing it to a ramdisk - shouldn't have a significant speed penalty and you can use the standard functions

Upvotes: 0

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