Adult image validation – PHP

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In this article, we will teach you how to have adult image validation in your PHP website. Suppose you are creating a website where you allow people to upload images. And some people start uploading nudity images. Now you want to stop them.

Video tutorial:

For the sake of simplicity, we are creating a simple HTML form that allows users to upload images.

<form method="POST" action="upload.php" enctype="multipart/form-data">
	<input type="file" name="file" />
	<input type="submit" />
</form>

This shows an input file and a submit button. Then we need to download a class named “class.ImageFilter.php”. You can download it from here. I am also writing the class here:

<?php

// class.ImageFilter.php

class ImageFilter
{                              #R  G  B
    var $colorA = 7944996;     #79 3B 24
    var $colorB = 16696767;    #FE C5 BF


    var $arA = array();
    var $arB = array();
    
    public function __construct()
    {
        $this->arA['R'] = ($this->colorA >> 16) & 0xFF;
        $this->arA['G'] = ($this->colorA >> 8) & 0xFF;
        $this->arA['B'] = $this->colorA & 0xFF;
        
        $this->arB['R'] = ($this->colorB >> 16) & 0xFF;
        $this->arB['G'] = ($this->colorB >> 8) & 0xFF;
        $this->arB['B'] = $this->colorB & 0xFF;
    }
    
    function GetScore($image)
    {
        $x = 0; $y = 0;
        $img = $this->_GetImageResource($image, $x, $y);
        if(!$img) return false;

        $score = 0;
        
        $xPoints = array($x/8, $x/4, ($x/8 + $x/4), $x-($x/8 + $x/4), $x-($x/4), $x-($x/8));
        $yPoints = array($y/8, $y/4, ($y/8 + $y/4), $y-($y/8 + $y/4), $y-($y/8), $y-($y/8));
        $zPoints = array($xPoints[2], $yPoints[1], $xPoints[3], $y);

        
        for($i=0; $i<=$x; $i++)
        {
            for($j=0; $j<=$y; $j++)
            {
                $color = imagecolorat($img, $i, $j);
                if($color >= $this->colorA && $color <= $this->colorB)
                {
                    $color = array('R'=> ($color >> 16) & 0xFF, 'G'=> ($color >> 8) & 0xFF, 'B'=> $color & 0xFF);
                    if($color['G'] >= $this->arA['G'] && $color['G'] <= $this->arB['G'] && $color['B'] >= $this->arA['B'] && $color['B'] <= $this->arB['B'])
                    {
                        if($i >= $zPoints[0] && $j >= $zPoints[1] && $i <= $zPoints[2] && $j <= $zPoints[3])
                        {
                            $score += 3;
                        }
                        elseif($i <= $xPoints[0] || $i >=$xPoints[5] || $j <= $yPoints[0] || $j >= $yPoints[5])
                        {
                            $score += 0.10;
                        }
                        elseif($i <= $xPoints[0] || $i >=$xPoints[4] || $j <= $yPoints[0] || $j >= $yPoints[4])
                        {
                            $score += 0.40;
                        }
                        else
                        {
                            $score += 1.50;
                        }
                    }
                }
            }
        }
        
        imagedestroy($img);
        
        $score = sprintf('%01.2f', ($score * 100) / ($x * $y));
        if($score > 100) $score = 100;
        return $score;
    }
    
    function GetScoreAndFill($image, $outputImage)
    {
        $x = 0; $y = 0;
        $img = $this->_GetImageResource($image, $x, $y);
        if(!$img) return false;

        $score = 0;

        $xPoints = array($x/8, $x/4, ($x/8 + $x/4), $x-($x/8 + $x/4), $x-($x/4), $x-($x/8));
        $yPoints = array($y/8, $y/4, ($y/8 + $y/4), $y-($y/8 + $y/4), $y-($y/8), $y-($y/8));
        $zPoints = array($xPoints[2], $yPoints[1], $xPoints[3], $y);


        for($i=1; $i<=$x; $i++)
        {
            for($j=1; $j<=$y; $j++)
            {
                $color = imagecolorat($img, $i, $j);
                if($color >= $this->colorA && $color <= $this->colorB)
                {
                    $color = array('R'=> ($color >> 16) & 0xFF, 'G'=> ($color >> 8) & 0xFF, 'B'=> $color & 0xFF);
                    if($color['G'] >= $this->arA['G'] && $color['G'] <= $this->arB['G'] && $color['B'] >= $this->arA['B'] && $color['B'] <= $this->arB['B'])
                    {
                        if($i >= $zPoints[0] && $j >= $zPoints[1] && $i <= $zPoints[2] && $j <= $zPoints[3])
                        {
                            $score += 3;
                            imagefill($img, $i, $j, 16711680);
                        }
                        elseif($i <= $xPoints[0] || $i >=$xPoints[5] || $j <= $yPoints[0] || $j >= $yPoints[5])
                        {
                            $score += 0.10;
                            imagefill($img, $i, $j, 14540253);
                        }
                        elseif($i <= $xPoints[0] || $i >=$xPoints[4] || $j <= $yPoints[0] || $j >= $yPoints[4])
                        {
                            $score += 0.40;
                            imagefill($img, $i, $j, 16514887);
                        }
                        else
                        {
                            $score += 1.50;
                            imagefill($img, $i, $j, 512);
                        }
                    }
                }
            }
        }
        imagejpeg($img, $outputImage);

        imagedestroy($img);

        $score = sprintf('%01.2f', ($score * 100) / ($x * $y));
        if($score > 100) $score = 100;
        return $score;
    }
    
    function _GetImageResource($image, &$x, &$y)
    {
        $info = GetImageSize($image);
        
        $x = $info[0];
        $y = $info[1];
        
        switch( $info[2] )
        {
            case IMAGETYPE_GIF:
                return @ImageCreateFromGif($image);
                
            case IMAGETYPE_JPEG:
                return @ImageCreateFromJpeg($image);
                
            case IMAGETYPE_PNG:
                return @ImageCreateFromPng($image);
                
            default:
                return false;
        }
    }
}

Now to handle the input file uploaded from the form, we need to create a file named “upload.php”. Following will be the code of this file.

<?php

require_once "class.ImageFilter.php";

move_uploaded_file($_FILES["file"]["tmp_name"], "image.png");

$filter = new ImageFilter();
$score = $filter->GetScore("image.png");

unlink("image.png");

echo $score;

if ($score > 60)
{
	echo "<p>Image contains adult content.</p>";
}
  1. First, we are including the class in our PHP file.
  2. Then we save the image file as “image.png”, you can set any name of your choice.
  3. Then we are creating an instance of ImageFilter class.
  4. Then we are getting the score of the newly created image file. A score of 61 and above is considered to contain nudity content.
  5. Then we are removing the image file we saved.
  6. And display the score to the user, you can remove this line if you do not want to show the scores to the user.
  7. Finally, we are putting a condition that says “if the score is greater than 60, then display an error message.”

So that’s how you can add an adult image validation feature to your PHP website. If you want to see this feature in action, we implemented this feature in our social network project. If you face any difficulty in implementing this in your project, feel free to contact us.

Source code – Adult image validation

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