Php 信箱图像，并用另一图像填充空白

我目前正在使用GD php库缩放一些图像的信箱样式，并用黑色填充生成的空白。但是，我需要使用另一个图像文件中的模式填充空白。有什么办法吗

这是我用来缩放图像的代码：

    function resize_image($source_image, $destination_width, $destination_height, $type = 0) {
    // $type (1=crop to fit, 2=letterbox)
    $source_width = imagesx($source_image);
    $source_height = imagesy($source_image);
    $source_ratio = $source_width / $source_height;
    $destination_ratio = $destination_width / $destination_height;
    if ($type == 1) {
        // crop to fit
        if ($source_ratio > $destination_ratio) {
            // source has a wider ratio
            $temp_width = (int)($source_height * $destination_ratio);
            $temp_height = $source_height;
            $source_x = (int)(($source_width - $temp_width) / 2);
            $source_y = 0;
        } else {
            // source has a taller ratio
            $temp_width = $source_width;
            $temp_height = (int)($source_width / $destination_ratio);
            $source_x = 0;
            $source_y = (int)(($source_height - $temp_height) / 2);
        }
        $destination_x = 0;
        $destination_y = 0;
        $source_width = $temp_width;
        $source_height = $temp_height;
        $new_destination_width = $destination_width;
        $new_destination_height = $destination_height;
    } else {
        // letterbox
        if ($source_ratio < $destination_ratio) {
            // source has a taller ratio
            $temp_width = (int)($destination_height * $source_ratio);
            $temp_height = $destination_height;
            $destination_x = (int)(($destination_width - $temp_width) / 2);
            $destination_y = 0;
        } else {
            // source has a wider ratio
            $temp_width = $destination_width;
            $temp_height = (int)($destination_width / $source_ratio);
            $destination_x = 0;
            $destination_y = (int)(($destination_height - $temp_height) / 2);
        }
        $source_x = 0;
        $source_y = 0;
        $new_destination_width = $temp_width;
        $new_destination_height = $temp_height;
    }
    $destination_image = imagecreatetruecolor($destination_width, $destination_height);
    if ($type > 1) {
        imagefill($destination_image, 0, 0, imagecolorallocate($destination_image, 0, 0, 0));
    }
    imagecopyresampled($destination_image, $source_image, $destination_x, $destination_y, $source_x, $source_y, $new_destination_width, $new_destination_height, $source_width, $source_height);
    return $destination_image;
}

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$pattern是背景图像的文件路径，用于填充信箱

首先准备背景，创建平铺画布以覆盖信箱，然后使用或的source_x/y/w/h参数将图像的信盒部分复制到此资源中。

环顾四周，我猜我想使用imagecopyresampled之类的工具，但我不确定如何操作。谢谢，我会仔细阅读这些方法，看看是否能找到答案！

        $destination_image = imagecreatetruecolor($destination_width, $destination_height);

    if ($type > 1) {
        if ($pattern != NULL) {
            $pattern = imagecreatefrompng($pattern);
            imagesettile($destination_image, $pattern);
            imagefill($destination_image, 0, 0, IMG_COLOR_TILED);
        } else {
            imagefill($destination_image, 0, 0, imagecolorallocate($destination_image, 0, 0, 0));
        }
    }
    imagecopyresampled($destination_image, $source_image, $destination_x, $destination_y, $source_x, $source_y, $new_destination_width, $new_destination_height, $source_width, $source_height);
    return $destination_image;