PHP - Check Fake Image File

PHP - CheckFakeImageFile.php

$target_dir = "upload-folder/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);

if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
	if (exif_imagetype($_FILES["fileToUpload"]["tmp_name"]) != IMAGETYPE_JPEG) {
        echo 'File bukan gambar asli..';
		$uploadOk = 0;
	} else {
		$uploadOk = 1;
		echo "File Berhasil diupload" . $target_file ;
		echo "MIME : " . $check["mime"] . ".";
	}
}