使用PHP实现阻止用户上传成人照片或者裸照

include ('nf.php');

$filter = new ImageFilter;

$score = $filter -> GetScore($_FILES['img']['tmp_name']);

if($score >= 60){
/Message/
}

<?php
/Include the Nudity Filter file/
include ('nf.php');
/Create a new class called $filter/
$filter = new ImageFilter;
/Get the score of the image/
$score = $filter -> GetScore($_FILES['img']['tmp_name']);
/If the $score variable is set/
if (isset($score)) {
    /If the image contains nudity, display image score and message. Score value if more than 60%, it is considered an adult image./
    if ($score >= 60) {
        echo "Image scored " . $score . "%, It seems that you have uploaded a nude picture.";
    /If the image doesn't contain nudity/   
    } else if ($score < 0) {
        echo "Congratulations, you have uploaded an non-nude image.";
    }
}
?>

<form method="post" enctype="multipart/form-data" action="<?php echo $SERVER['PHP_SELF'];?> ">
Upload image:
<input type="file" name="img" id="img" />
<input type="submit" value="Sumit Image" />
</form>