How can file validation be improved to ensure that only images are uploaded in a PHP application?

To ensure that only images are uploaded in a PHP application, file validation can be improved by checking the file type using the `exif_imagetype()` function. This function returns the image type based on the file content, allowing us to verify if the uploaded file is indeed an image. 

// Check if the uploaded file is an image
$imageFileType = exif_imagetype($_FILES["fileToUpload"]["tmp_name"]);
if($imageFileType === false){
    echo "File is not an image.";
    $uploadOk = 0;
}

Keywords

file validation image upload PHP application MIME type file extension

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