如何把两张图片合并,生成第三张图片

Question

  ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);

Answer 1

 function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH)
    {
        if(function_exists("imagecreatetruecolor"))
        {
            @$creatImg = ImageCreateTrueColor($creatW,$creatH);
            $black=ImageColorAllocate($creatImg,255,255,255);//填充的背景色你可以重新指定，我用的是黑色         
            imagefilledrectangle($creatImg,0,0,$creatW,$creatH,$black);         
            
            if($creatImg) 
                ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
            else
            {
                $creatImg=ImageCreateTrueColor($creatW,$creatH);                 
               ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
            }
         }
         else
         {
            $creatImg=ImageCreateTrueColor($creatW,$creatH);
            ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
         }
         return $creatImg;
    }

Answer 2

gd库有缺陷，现在多用image_magick

Answer 3

但大小只能为一张图片的大小你可以先用imagecreatetruecolor 创建一张你想要的大小的空白图片。
再用imagecopyresized 把图片加上去水印也是一样用imagecopyresized的