在 PHP 中将 JPG/GIF 图像转换为 PNG?
可能重复
将jpg图像转换为gif、png &使用PHP的bmp格式
我有一个 PHP 表单,它允许上传图片并检查 exif_imagetype();
以确保图片有效.
I have a PHP form that allows image uploads and checks exif_imagetype();
to make sure an image is valid.
但是,我希望所有格式(PNG、JPG、JPEG 和 GIF)在提交后最终都是 PNG.
However, I want all formats, PNG, JPG, JPEG, and GIF, to end up being PNG once submitted.
我该怎么做?
推荐答案
你只需要imagepng()
那么.事实上,它几乎变成了一条线:
You just need imagepng()
then. In fact it almost becomes a one-liner:
imagepng(imagecreatefromstring(file_get_contents($filename)), "output.png");
您将使用 $_FILES["id"]["tmp_name"]
作为文件名,并且显然使用不同的输出文件名.但是图像格式探测本身就会变得多余.
You would use $_FILES["id"]["tmp_name"]
for the filename, and a different output filename obviously. But the image format probing itself would become redundant.
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