How to load external images with php drawing skills

//1. Create canvas
$im = imagecreatetruecolor(300,200);//Create a new true color image, the default background is black, and return the image identifier. There is also a function imagecreate that has been deprecated.
//2. Load external images
$im_new = imagecreatefromjpeg("baidu.jpg");//Return the image identifier
$im_new_info = getimagesize("baidu.jpg");/ /Get the image size and return an array. This function does not require the use of the gd library.
/*----
****3. Copy the loaded image to the canvas
****Parameter description:
 $im: Needless to say, it refers to the canvas;
 $im_new: source image, That is, the image loaded in from the outside
 (30,30): Place the loaded image in the position of the canvas. The upper left corner
 (0,0): Indicates where the loaded image starts. (0,0) represents the starting point of the upper left corner. You can also load only a part of the image. (*,*): represented by *, it can be the width and height of the original image, or it can be smaller than the width and height. Only a part of the image is intercepted, and it is the same as the above Used together with coordinates, it represents the intercepted part
******/bbs.it-home.org
imagecopy($im,$im_new,30,30,0,0,$im_new_info[0],$im_new_info[1 ]);//Return Boolean value
//3. Output image
header("content-type: image/png");
imagepng($im);//Output to page . If there is a second parameter [,$filename], it means saving the image
//4. Destroy the image and release the memory
imagedestroy($im);
?>