PHP synthesis or creation of gif animation

1. First, you need to confirm whether the GD library is normal.

2. If it is a composite image, please make sure to put the decomposed image in the frames folder.

3. GIFEncoder.class.php class

include "GIFEncoder.class.php";

ob_start();
$board_width = 60;
$board_height = 60;
$pad_width = 5;
$pad_height = 15;
$ ball_size = 5;
$game_width = $board_width - $pad_width*2 - $ball_size;
$game_height = $board_height-$ball_size;

$x = 0;
$y = rand(0,$game_height);
$ xv = rand(1,10);
$yv = rand(1,10);
$pt[] = array($x,$y);
do{
 $x += $xv;
 $y + = $yv;
 if($x > $game_width){
 $xv = -1*$xv;
 $x = $game_width - ($x-$game_width);
 }elseif($x < 0) {
 $xv = -1*$xv;
 $x = abs($x);
 }
 if($y>$game_height){
 $yv = -1*$yv;
 $y = $game_height - ($y - $game_height);
 }elseif($y<0){
 $yv = -1*$yv;
 $y = abs($y);
 }
 $pt[] = array($x ,$y);
}while($x!=$pt[0][0]||$y!=$pt[0][1]);

$i = 0;
while(isset($ pt[$i])){
 $image = imagecreate($board_width,$board_height);
 imagecolorallocate($image, 0,0,0);
 $color = imagecolorallocate($image, 255,255,255);
 $color2 = imagecolorallocate($image, 255,0,0);

 if($pt[$i][1] + $pad_height < $board_width){
 imagefilledrectangle($image,0,$pt[$i][1 ],$pad_width, $pt[$i][1]+$pad_height,$color);
 }else{
 imagefilledrectangle($image,0,$board_width-$pad_height,$pad_width, $board_width,$color);
 }
 imagefilledrectangle($image,$board_width-$pad_width,0,$board_width, $board_height,$color2);
 imagefilledrectangle($image,$pad_width+$pt[$i][0], $ball_size+$pt[$ i][1]-$ball_size, $pad_width+$pt[$i][0]+$ball_size, $ball_size+$pt[$i][1],$color);
 //imagesetpixel($image,$pt [$i][0],$pt[$i][1],$color);
 imagegif($image);
 imagedestroy($image);
 $imagedata[] = ob_get_contents();
 ob_clean() ;
 ++$i;
}

$gif = new GIFEncoder(
 $imagedata,
 100,
 0,
 2,
 0, 0, 1,
 "bin"
 );

Header ('Content -type:image/gif');
echo $gif->GetAnimation();
?>