`<?php
$rootpath = '';
require('incfiles/core.php');
use PHPImageWorkshop\ImageWorkshop;
require_once($phpbb_root_path.'PHPImageWorkshop/ImageWorkshop.php');
class GifCreator
{
/**
* @var string The gif string source (old: this->GIF)
*/
private $gif;

/**
 * @var string Encoder version (old: this->VER)
 */
private $version;

/**
 * @var boolean Check the image is build or not (old: this->IMG)
 */
private $imgBuilt;

/**
 * @var array Frames string sources (old: this->BUF)
 */
private $frameSources;

/**
 * @var integer Gif loop (old: this->LOP)
 */
private $loop;

/**
 * @var integer Gif dis (old: this->DIS)
 */
private $dis;

/**
 * @var integer Gif color (old: this->COL)
 */
private $colour;

/**
 * @var array (old: this->ERR)
 */
private $errors;

// Methods
// ===================================================================================

/**
 * Constructor
 */
public function __construct()
{
    $this->reset();
    
    // Static data
    $this->version = 'GifCreator: Under development';
    $this->errors = array(
        'ERR00' => 'Does not supported function for only one image.',
		'ERR01' => 'Source is not a GIF image.',
		'ERR02' => 'You have to give resource image variables, image URL or image binary sources in $frames array.',
		'ERR03' => 'Does not make animation from animated GIF source.',
    );
}

/**
 * Create the GIF string (old: GIFEncoder)
 * 
 * @param array $frames An array of frame: can be file paths, resource image variables, binary sources or image URLs
 * @param array $durations An array containing the duration of each frame
 * @param integer $loop Number of GIF loops before stopping animation (Set 0 to get an infinite loop)
 * 
 * @return string The GIF string source
 */
public function create($frames = array(), $durations = array(), $loop = 0)
{
	if (!is_array($frames) && !is_array($GIF_tim)) {
        
        throw new \Exception($this->version.': '.$this->errors['ERR00']);
	}
    
	$this->loop = ($loop > -1) ? $loop : 0;
	$this->dis = 2;
    
	for ($i = 0; $i < count($frames); $i++) {
	  
		if (is_resource($frames[$i])) { // Resource var
            
            $resourceImg = $frames[$i];
            
            ob_start();
            imagegif($frames[$i]);
            $this->frameSources[] = ob_get_contents();
            ob_end_clean();
            
        } elseif (is_string($frames[$i])) { // File path or URL or Binary source code
		     
            if (file_exists($frames[$i]) || filter_var($frames[$i], FILTER_VALIDATE_URL)) { // File path
                
                $frames[$i] = file_get_contents($frames[$i]);                    
            }
            
            $resourceImg = imagecreatefromstring($frames[$i]);
            
            ob_start();
            imagegif($resourceImg);
            $this->frameSources[] = ob_get_contents();
            ob_end_clean();
             
		} else { // Fail
            
            throw new \Exception($this->version.': '.$this->errors['ERR02'].' ('.$mode.')');
		}
        
        if ($i == 0) {
            
            $colour = imagecolortransparent($resourceImg);
        }
        
		if (substr($this->frameSources[$i], 0, 6) != 'GIF87a' && substr($this->frameSources[$i], 0, 6) != 'GIF89a') {
		 
            throw new \Exception($this->version.': '.$i.' '.$this->errors['ERR01']);
		}
        
		for ($j = (13 + 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07))), $k = TRUE; $k; $j++) {
		 
			switch ($this->frameSources[$i] { $j }) {
			    
				case '!':
                
					if ((substr($this->frameSources[$i], ($j + 3), 8)) == 'NETSCAPE') {
                        
                        throw new \Exception($this->version.': '.$this->errors['ERR03'].' ('.($i + 1).' source).');
					}
                    
				break;
                    
				case ';':
                
					$k = false;
				break;
			}
		}
        
        unset($resourceImg);
	}
	
    if (isset($colour)) {
        
        $this->colour = $colour;
                                
    } else {
        
        $red = $green = $blue = 0;
        $this->colour = ($red > -1 && $green > -1 && $blue > -1) ? ($red | ($green << 8) | ($blue << 16)) : -1;
    }
    
	$this->gifAddHeader();
    
	for ($i = 0; $i < count($this->frameSources); $i++) {
	  
		$this->addGifFrames($i, $durations[$i]);
	}
    
	$this->gifAddFooter();
    
    return $this->gif;
}

// Internals
// ===================================================================================

/**
 * Add the header gif string in its source (old: GIFAddHeader)
 */
public function gifAddHeader()
{
	$cmap = 0;

	if (ord($this->frameSources[0] { 10 }) & 0x80) {
	  
		$cmap = 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07));

		$this->gif .= substr($this->frameSources[0], 6, 7);
		$this->gif .= substr($this->frameSources[0], 13, $cmap);
		$this->gif .= "!\377\13NETSCAPE2.0\3\1".$this->encodeAsciiToChar($this->loop)."\0";
	}
}

/**
 * Add the frame sources to the GIF string (old: GIFAddFrames)
 * 
 * @param integer $i
 * @param integer $d
 */
public function addGifFrames($i, $d)
{
	$Locals_str = 13 + 3 * (2 << (ord($this->frameSources[ $i ] { 10 }) & 0x07));

	$Locals_end = strlen($this->frameSources[$i]) - $Locals_str - 1;
	$Locals_tmp = substr($this->frameSources[$i], $Locals_str, $Locals_end);

	$Global_len = 2 << (ord($this->frameSources[0 ] { 10 }) & 0x07);
	$Locals_len = 2 << (ord($this->frameSources[$i] { 10 }) & 0x07);

	$Global_rgb = substr($this->frameSources[0], 13, 3 * (2 << (ord($this->frameSources[0] { 10 }) & 0x07)));
	$Locals_rgb = substr($this->frameSources[$i], 13, 3 * (2 << (ord($this->frameSources[$i] { 10 }) & 0x07)));

	$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) | 1 + 0).chr(($d >> 0 ) & 0xFF).chr(($d >> 8) & 0xFF)."\x0\x0";

	if ($this->colour > -1 && ord($this->frameSources[$i] { 10 }) & 0x80) {
	  
		for ($j = 0; $j < (2 << (ord($this->frameSources[$i] { 10 } ) & 0x07)); $j++) {
		 
			if (ord($Locals_rgb { 3 * $j + 0 }) == (($this->colour >> 16) & 0xFF) &&
				ord($Locals_rgb { 3 * $j + 1 }) == (($this->colour >> 8) & 0xFF) &&
				ord($Locals_rgb { 3 * $j + 2 }) == (($this->colour >> 0) & 0xFF)
			) {
				$Locals_ext = "!\xF9\x04".chr(($this->dis << 2) + 1).chr(($d >> 0) & 0xFF).chr(($d >> 8) & 0xFF).chr($j)."\x0";
				break;
			}
		}
	}
    
	switch ($Locals_tmp { 0 }) {
	  
		case '!':
        
			$Locals_img = substr($Locals_tmp, 8, 10);
			$Locals_tmp = substr($Locals_tmp, 18, strlen($Locals_tmp) - 18);
                            
		break;
            
		case ',':
        
			$Locals_img = substr($Locals_tmp, 0, 10);
			$Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
                            
		break;
	}
    
	if (ord($this->frameSources[$i] { 10 }) & 0x80 && $this->imgBuilt) {
	  
		if ($Global_len == $Locals_len) {
		 
			if ($this->gifBlockCompare($Global_rgb, $Locals_rgb, $Global_len)) {
			    
				$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
                
			} else {
			    
				$byte = ord($Locals_img { 9 });
				$byte |= 0x80;
				$byte &= 0xF8;
				$byte |= (ord($this->frameSources[0] { 10 }) & 0x07);
				$Locals_img { 9 } = chr($byte);
				$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
			}
            
		} else {
		 
			$byte = ord($Locals_img { 9 });
			$byte |= 0x80;
			$byte &= 0xF8;
			$byte |= (ord($this->frameSources[$i] { 10 }) & 0x07);
			$Locals_img { 9 } = chr($byte);
			$this->gif .= $Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp;
		}
        
	} else {
	  
		$this->gif .= $Locals_ext.$Locals_img.$Locals_tmp;
	}
    
	$this->imgBuilt = true;
}

/**
 * Add the gif string footer char (old: GIFAddFooter)
 */
public function gifAddFooter()
{
	$this->gif .= ';';
}

/**
 * Compare two block and return the version (old: GIFBlockCompare)
 * 
 * @param string $globalBlock
 * @param string $localBlock
 * @param integer $length
 * 
 * @return integer
 */
public function gifBlockCompare($globalBlock, $localBlock, $length)
{
	for ($i = 0; $i < $length; $i++) {
	  
		if ($globalBlock { 3 * $i + 0 } != $localBlock { 3 * $i + 0 } ||
			$globalBlock { 3 * $i + 1 } != $localBlock { 3 * $i + 1 } ||
			$globalBlock { 3 * $i + 2 } != $localBlock { 3 * $i + 2 }) {
			
            return 0;
		}
	}

	return 1;
}

/**
 * Encode an ASCII char into a string char (old: GIFWord)
 * 
 * $param integer $char ASCII char
 * 
 * @return string
 */
public function encodeAsciiToChar($char)
{
	return (chr($char & 0xFF).chr(($char >> 8) & 0xFF));
}

/**
 * Reset and clean the current object
 */
public function reset()
{
    $this->frameSources;
    $this->gif = 'GIF89a'; // the GIF header
    $this->imgBuilt = false;
    $this->loop = 0;
    $this->dis = 2;
    $this->colour = -1;
}

// Getter / Setter
// ===================================================================================

/**
 * Get the final GIF image string (old: GetAnimation)
 * 
 * @return string
 */
public function getGif()
{
	return $this->gif;
}

}
$base = ImageWorkshop::initFromPath($rootpath.'/learnecom/images/blank.png'); //tao anh trong
$base2 = ImageWorkshop::initFromPath($rootpath.'/learnecom/images/blank.png'); //tao anh trong (2)

$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/images/canh/2.png');
$base->addLayerOnTop($canh, 0, 10, "LB");

$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/equip/quanao/m/5.png');
$base->addLayerOnTop($canh, 0, 0, "LB");
$base2->addLayerOnTop($canh, 0, 0, "LB");
$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/equip/bieucam/m/3.png');
$base->addLayerOnTop($canh, 0, 0, "LB");
$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/equip/bieucam/m/3-2.png');
$base2->addLayerOnTop($canh, 0, 0, "LB");
$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/images/toc/1.png');
$base->addLayerOnTop($canh, 0, 0, "LB");
$base2->addLayerOnTop($canh, 0, 0, "LB");

$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/images/kinh/7.png');
$base->addLayerOnTop($canh, 0, 0, "LB");

$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/images/non/25.png');
$base->addLayerOnTop($canh, 0, 0, "LB");

$canh=ImageWorkshop::initFromPath($rootpath.'/learnecom/images/vukhi/2.png');
$base->addLayerOnTop($canh, 0, 0, "LB");

$desiredWidth = 120;
$desiredHeight = 150;
$image = $base->getResult();
$image2 = $base2->getResult();
$frames = array($image,$image2);
$durations = array(150, 50);
$gc = new GifCreator();
$gc->create($frames, $durations, 0);
$gifBinary = $gc->getGif();
header('Content-type: image/gif');
echo $gifBinary;
exit;
?>`
This is simple, right ?

Black Background of Gif ? help me #95

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