如何利用PHP拼接多张图片为一张长图？

现有多张短图，拼接成一张长图，如何简单实现？

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现有多张短图，拼接成一张长图，如何简单实现？

 $v) {
    $source[$k]['source'] = Imagecreatefromjpeg($v);
     
    $source[$k]['size'] = getimagesize($v);
     
}
 
//imagecopy ($target_img,$source[0]['source'],2,2,0,0,$source[0]['size'][0],$source[0]['size'][1]);
//imagecopy ($target_img,$source[1]['source'],250,2,0,0,$source[1]['size'][0],$source[1]['size'][1]);
$num1 = 0;
$num  = 1;
$tmp  = 2;
$tmpy = 2; //图片之间的间距
for ($i = 0; $i 

imagecopyresample.