images2张图片合并

<?php   $path_1 = "./sucai/big.png";  $path_2 = "./sucai/small.jpg";  $image_1 = imagecreatefrompng($path_1);  $image_2 = imagecreatefromjpeg($path_2);  $image_3 = imageCreatetruecolor(imagesx($image_1),imagesy($image_1));  $color = imagecolorallocate($image_3, 255, 255, 255);  imagefill($image_3, 0, 0, $color);  imageColorTransparent($image_3, $color);    imagecopyresampled($image_3,$image_1,0,0,0,0,imagesx($image_1),imagesy($image_1),imagesx($image_1),imagesy($image_1));  imagecopymerge($image_3,$image_2, 230,43,0,0,imagesx($image_2),imagesy($image_2), 100);  //将画布保存到指定的gif文件  imagegif($image_3, "all.jpg");  echo "<img src='all.jpg'>";