imagegd2()

(PHP 4 >= 4.0.7, PHP 5, PHP 7)

将 GD2 图像输出到浏览器或文件

说明

imagegd2()将一个 GD 图像输出到$filename。$image

参数

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

文件保存的路径，如果未设置或为NULL，将会直接输出原始图象流。

Chunk size.

可以是IMG_GD2_RAW或IMG_GD2_COMPRESSED。默认为IMG_GD2_RAW。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

输出一个 GD2 图像

保存 GD2 图像

注释

Note:

GD2 格式一般是用来加载图像中的一部分时更快。注意 GD2 格式只能用于兼容于 GD2 的应用程序。

更新日志

参见

• imagegd()将 GD 图像输出到浏览器或文件

You can use this function in combination with imagecreatefromstring() to clone the gd resource with minimum fuss (no writing to tmp file): 

yes, the gd2 file format does improve the speed of image creations as the data-setup is designed to be native for the GD function - ie, the image doesn't have to be converted to a usable format prior to processing.
you may also note that the newer gd2 format creates much smaller size files than the older imagegd function, certainly for images involving chunks of single colours anyway. you'll probably find this function most useful for saving overlay images or background images used in larger image creation scripts.
to read a ping or jpeg image (.png / .jpg) and save a .gd2 version to server...
$img = $_GET['img'];
if(file_exists($img))
  {
  $dim = getimagesize($img);
  $cr = ($dim[2] 

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