Are there any potential pitfalls to be aware of when determining file types in PHP?

When determining file types in PHP, one potential pitfall to be aware of is that relying solely on file extensions can be unreliable, as they can be easily manipulated. To mitigate this risk, it is recommended to use PHP's built-in functions like `finfo_file()` or `mime_content_type()` to accurately determine the file type based on its contents. 

// Using finfo_file() to determine file type
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$fileType = finfo_file($finfo, $filePath);
finfo_close($finfo);

echo "The file type is: " . $fileType;

Keywords

file types PHP MIME types finfo getimagesize

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