How big would a typical file header be?

PHP
1

I’m using this code to get the MIME from the file header:

$fileInfo = new \finfo(FILEINFO_MIME);
$mimeType = $fileInfo->buffer(file_get_contents($_FILES[$formVar]['tmp_name']));

However, this could be a memory hog on large files as it reads the entire file into a string. I can easily truncate this but how many characters would you truncate it to to check a file header?

2

Can you not use http://php.net/manual/en/function.finfo-file.php instead of buffer to get the information without loading the entire file contents?

3

Ah yeah, didn’t know about that function! Thanks, I’ve just tested it and the memory used shows that it definitely just reads the header. Thanks a long, simple elegant solution!

4

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