How can we handle image uploads with no MIME type specified?

When handling image uploads with no MIME type specified, we can use PHP's getimagesize() function to determine the MIME type of the uploaded image. This function returns an array containing information about the image, including the MIME type. We can then use this MIME type to validate the image before processing it further. 

// Check if file is an image
$image_info = getimagesize($_FILES["file"]["tmp_name"]);
if($image_info !== false) {
    $mime_type = $image_info['mime'];
    // Validate MIME type
    if($mime_type == 'image/jpeg' || $mime_type == 'image/png' || $mime_type == 'image/gif') {
        // Process the image further
    } else {
        echo "Invalid MIME type. Only JPEG, PNG, and GIF images are allowed.";
    }
} else {
    echo "Invalid image file.";
}

Keywords

PHP image uploads MIME type file validation error handling

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