How to combine two photos of the front and back of an ID card into one picture using PHP

<?php
/*
$dst_path = "sfz-blank.jpg";
$z_path = "./z.jpg";
$f_path = "./f.jpg";
$wp_path = "sfz-wp.png";

$dst = @imagecreatefromjpeg($dst_path);
$im_z = imagecreatefromjpeg($z_path);//返回图像标识符
$im_f = imagecreatefromjpeg($f_path);//返回图像标识符
$im_wp = imagecreatefrompng($wp_path);//返回图像标识符

list($z_width,$z_height,$z_type,$z_attr)=getimagesize($z_path);
list($f_width,$f_height,$f_type,$f_attr)=getimagesize($f_path);

//imagecopyresized ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h )
imagecopyresized($dst,$im_z,10,10,0,0,580,360,$z_width,$z_height);//返回布尔值
imagecopyresized($dst,$im_f,10,380,0,0,580,360,$f_width,$f_height);//返回布尔值
imagecopyresized($dst,$im_wp,10,320,0,0,600,165,600,165);//返回布尔值

imagejpeg($dst, &#39;./&#39;.time().".jpg");
imagedestroy($dst);

echo &#39;ok&#39;;
*/


$path_z = "./z.jpg";
$path_f = "./f.jpg";
echo makeSfzImage($path_z, $path_f);


/**
 * 通过身份证正面和背景照片，生成一图组合图片，并打上水印
 * 需要准备一张空白图片、一张水印图片，放在/webui/member/images/目录下，并在Upload目录下建sfz目录
 * @param string $path_z，正面
 * @param string $path_f，背面
 * @return string，生成后的照片路径，注意返回的格式是：./Upload/sfz/148909883.jpg
 *
 */
function makeSfzImage($path_z, $path_f){
  /*
  * 前面几项配置信息
  */
  $path_blank = realpath(&#39;./webui/member/images/sfz-blank.jpg&#39;); //空白图片地址，用于打底
  $path_wp = realpath(&#39;./webui/member/images/sfz-wp.png&#39;); //水印图片地址
  $path_save = &#39;./Upload/sfz/&#39;; //保存路径

  //导入四张图片
  $im_blank = @imagecreatefromjpeg($path_blank);
  $im_z = @imagecreatefromjpeg($path_z);//返回图像标识符
  $im_f = @imagecreatefromjpeg($path_f);//返回图像标识符
  $im_wp = @imagecreatefrompng($path_wp);//返回图像标识符

  //获取正反图片的宽高
  list($z_width,$z_height,$z_type,$z_attr)=getimagesize($path_z);
  list($f_width,$f_height,$f_type,$f_attr)=getimagesize($path_f);

  //imagecopyresized ( resource $dst_image , resource $src_image , int $dst_x , int $dst_y , int $src_x , int $src_y , int $dst_w , int $dst_h , int $src_w , int $src_h )
  //组合
  imagecopyresized($im_blank,$im_z,10,10,0,0,580,360,$z_width,$z_height);//返回布尔值
  imagecopyresized($im_blank,$im_f,10,380,0,0,580,360,$f_width,$f_height);//返回布尔值
  imagecopyresized($im_blank,$im_wp,10,320,0,0,600,165,600,165);//返回布尔值

  //生成
  $path_file = $path_save.time().".jpg";
  imagejpeg($im_blank, $path_file);
  imagedestroy($im_blank);

  return $path_file;
}
?>