使用php gd2将图像从一种格式保存到另一种格式 [英] Save image from one format to another with php gd2

问题描述

我有一个数据库，其中的一列填充有图像二进制数据.在进行了一些研究之后，我弄清楚了如何检测数据以哪种图像格式.可以说图像列中的记录为 gif 格式，现在我想用php gd2将其保存为 jpeg 格式.拜托，有人可以告诉我该怎么做吗?

I have a database with a column filled with image binaries data. After I made some research I figuried out how to detect in which image format is the data. Lets say in of the records in my images column is in gif format, now I want to save it with php gd2 to jpeg format. Please, can someone tell me how can I do that?

推荐答案

如果您只想将图像数据转换为JPEG，则只需 imagecreatefromstring 和 imagejpeg .基本上:

If you only want to convert the image data to JPEG then all you need is imagecreatefromstring and imagejpeg. Basically:

imagejpeg(imagecreatefromstring($gif_bindata), "temp.jpeg");
$jpeg_bindata = file_get_contents("temp.jpeg");

就这么简单，因为imagecreatefromstring自动检测文件类型(前几个字节包含足以使检测可行的魔术字节).显然，您可能想使用实际的临时文件名.

It's that simple because imagecreatefromstring detects the file type automatically (the first few bytes contain enough magic bytes to make detection feasible). And obviously you might want to use a real temporary filename instead.

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