diff --git a/README.md b/README.md
index 847eb0d..7c44bc7 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+> *NOTE: This is a fork of [Clément Guillemain](https://github.com/Sybio)'s nice [GifCreator class](https://github.com/Sybio/GifCreator), with some minor bug fixes and most pull requests merged together.
+
 # ================================
 # GifCreator
 # ================================
@@ -13,7 +15,7 @@ This class helps you to create an animated GIF image: give multiple images and t
 **1 - Creation:**
 
 ```php
-// Create an array containing file paths, resource var (initialized with imagecreatefromXXX), 
+// Create an array containing file paths, resource var (initialized with imagecreatefromXXX),
 // image URLs or even binary code from image files.
 // All sorted in order to appear.
 $frames = array(
@@ -23,11 +25,11 @@ $frames = array(
     'http://thisisafakedomain.com/images/pic4.jpg', // URL
 );
 
-// Create an array containing the duration (in millisecond) of each frames (in order too)
+// Create an array containing the duration (in centiseconds (hundredths of a second)) of each frames (in order too)
 $durations = array(40, 80, 40, 20);
 
 // Initialize and create the GIF !
-$gc = new GifCreator();
+$gc = new GifCreator\GifCreator();
 $gc->create($frames, $durations, 5);
 ```
 The 3rd parameter of create() method allows you to choose the number of loop of your animated gif before it stops.
@@ -59,9 +61,9 @@ file_put_contents('/myfolder/animated_picture.gif', $gifBinary);
 ### Behavior
 
 - The transparency is based on the first given frame. It will be saved only if you give multiple frames with same transparent background.
-- The dimensions of the generated GIF are based on the first frame. If you need to resize your frames to get the same dimension, you can use 
+- The dimensions of the generated GIF are based on the first frame. If you need to resize your frames to get the same dimension, you can use
 this class: https://github.com/Sybio/ImageWorkshop
 
 ### About
 
-The class reuses some part of code of "GIFEncoder.class.php" by László Zsidi (thanks to him).
\ No newline at end of file
+The class reuses some part of code of "GIFEncoder.class.php" by László Zsidi (thanks to him).
diff --git a/composer.json b/composer.json
index 9d98c23..02e7fce 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "sybio/gif-creator",
+    "name": "moroz1999/gif-creator",
     "type": "library",
     "description": "PHP class that creates animated GIF from multiple images",
     "keywords": ["gif", "animated", "creation", "encode", "PHP"],
@@ -13,9 +13,10 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0"
+        "php": "^8.0",
+        "ext-gd": "*"
     },
     "autoload": {
         "psr-0": { "GifCreator": "src" }
     }
-}
\ No newline at end of file
+}
diff --git a/src/GifCreator/GifCreator.php b/src/GifCreator/GifCreator.php
index 0726243..8d2e5ff 100644
--- a/src/GifCreator/GifCreator.php
+++ b/src/GifCreator/GifCreator.php
@@ -4,7 +4,7 @@
 
 /**
  * Create an animated GIF from multiple images
- * 
+ *
  * @version 1.0
  * @link https://github.com/Sybio/GifCreator
  * @author Sybio (Clément Guillemain  / @Sybio01)
@@ -17,12 +17,12 @@ class GifCreator
      * @var string The gif string source (old: this->GIF)
      */
     private $gif;
-    
+
     /**
      * @var string Encoder version (old: this->VER)
      */
-	private $version;
-    
+    private $version;
+
     /**
      * @var boolean Check the image is build or not (old: this->IMG)
      */
@@ -31,327 +31,333 @@ class GifCreator
     /**
      * @var array Frames string sources (old: this->BUF)
      */
-	private $frameSources;
-    
+    private $frameSources;
+
     /**
      * @var integer Gif loop (old: this->LOP)
      */
-	private $loop;
-    
+    private $loop;
+
     /**
      * @var integer Gif dis (old: this->DIS)
      */
-	private $dis;
-    
+    private $dis;
+
     /**
      * @var integer Gif color (old: this->COL)
      */
-	private $colour;
-    
+    private $colour;
+
     /**
      * @var array (old: this->ERR)
      */
-	private $errors;
- 
+    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.',
+            'ERR00' => 'Does not support single image/duration input.',
+            '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 array $durations An array containing the duration of each frame (in centiseconds)
      * @param integer $loop Number of GIF loops before stopping animation (Set 0 to get an infinite loop)
-     * 
      * @return string The GIF string source
+     * @throws \Exception
      */
-	public function create($frames = array(), $durations = array(), $loop = 0)
+    public function create($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[$i])) { // Resource var
-                
+        if (!is_array($frames) && !is_array($durations)) {
+
+            throw new \Exception($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]);                    
+
+                if ((substr($frames[$i], 0, 4) != 'GIF8') && 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.')');
-			}
-            
+
+            } 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 ';':
-                    
-						$k = false;
-					break;
-				}
-			}
-            
+
+            if (substr($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();
-        
+
+        $this->gifAddHeader();
+
+        for ($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()
+    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($this->loop)."\0";
-		}
-	}
-    
-	/**
+        if (ord($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, $cmap);
+            if ($this->loop != 1) {
+                // Browsers interpret loop count differently, but for loop == 1
+                // we can work around this by excluding loop count completely
+                // since all browsers seem to handle "no loop count" as
+                // "play once only".
+                $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, $d)
+    public function addGifFrames($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) + 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;
-	}
-    
-	/**
+        $Locals_str = 13 + 3 * (2 << (ord($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) + 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;
+                }
+            }
+        }
+        $Locals_img = '';
+
+        switch ($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()
+    public function gifAddFooter()
     {
-		$this->gif .= ';';
-	}
-    
-	/**
+        $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, $length)
+     */
+    public function gifBlockCompare($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 * $i + 2 }) {
-				
+        for ($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;
+    }
 
-		return 1;
-	}
-    
-	/**
+    /**
      * Encode an ASCII char into a string char (old: GIFWord)
-     * 
+     *
      * $param integer $char ASCII char
-     * 
+     *
+     * @param $char
      * @return string
-	 */
-	public function encodeAsciiToChar($char)
+     */
+    public function encodeAsciiToChar($char)
     {
-		return (chr($char & 0xFF).chr(($char >> 8) & 0xFF));
-	}
-    
+        return (chr($char & 0xFF) . chr(($char >> 8) & 0xFF));
+    }
+
     /**
      * Reset and clean the current object
      */
     public function reset()
     {
-        $this->frameSources;
+        $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()
+     */
+    public function getGif()
     {
-		return $this->gif;
-	}
+        return $this->gif;
+    }
 }
\ No newline at end of file
diff --git a/test/1.png b/test/1.png
new file mode 100644
index 0000000..fd52cea
Binary files /dev/null and b/test/1.png differ
diff --git a/test/2.png b/test/2.png
new file mode 100644
index 0000000..b879751
Binary files /dev/null and b/test/2.png differ
diff --git a/test/index.php b/test/index.php
new file mode 100644
index 0000000..81c3368
--- /dev/null
+++ b/test/index.php
@@ -0,0 +1,33 @@
+<?php
+
+	namespace GifCreator;
+	
+	require_once '../src/GifCreator/GifCreator.php';
+
+	// Create an array containing file paths, resource var (initialized with imagecreatefromXXX), 
+	// image URLs or even binary code from image files.
+	// All sorted in order to appear.
+	$frames = array(
+	    "1.png",
+	    "2.png",
+	);
+
+	// Create an array containing the duration (in millisecond) of each frames (in order too)
+	$durations = array(40, 80, 40);
+
+	// Initialize and create the GIF !
+	$gc = new GifCreator();
+	$gc->create($frames, $durations, 5);
+
+
+	$gifBinary = $gc->getGif();
+
+	if (isset($_GET['save'])) {
+		file_put_contents('final.gif', $gifBinary);
+	}else{
+		header('Content-type: image/gif');
+		header('Content-Disposition: filename="butterfly.gif"');
+		echo $gifBinary;
+		exit;
+	}
+