PHP : binary image data, checking the image type

Question

I have some images in bin, I want to check the header to check the format (jpg, png, etc)

I don\'t want to use temp files! I have a solution using TEMP FILES.

Answer 1

Use the fileinfo PHP extension:

http://de.php.net/manual/en/function.finfo-file.php

Its using the "file" *nix command to reliably determine the mime-type of a given file:

$finfo = finfo_open(FILEINFO_MIME_TYPE); 
$mimetype = finfo_file($finfo, $filename);
finfo_close($finfo);

This extension is shipped with PHP 5.3 or can be installed from pecl (pecl install fileinfo) for earlier versions.