[英]PHP - browser not caching dynamic image
I am having trouble getting my image script to cache the image in the browser (firefox). 我无法让我的图像脚本在浏览器中缓存图像(firefox)。
Here is the code : 这是代码:
$type = 'image/jpeg';
$image = '../../files/image.jpeg';
header("Content-type: $type");
header("Cache-Control: private, max-age=10800, pre-check=10800");
header("Pragma: private");
header("Expires: " . date(DATE_RFC822,strtotime("1 week")));
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
header('Last-Modified: '.$_SERVER['HTTP_IF_MODIFIED_SINCE'],true,304);
exit;
} else {
header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($image)).' GMT', true, 200);
echo @readfile($image);
exit;
}
The image gets outputted, however after that it always goes to the else statement with the 200 response code instead of the 304. I tried to force the 304, but it looks like the image is never cached by the browser. 图像被输出,但之后它总是转到带有200响应代码而不是304的else语句。我试图强制304,但看起来图像永远不会被浏览器缓存。
Try to call it as jpg (add this in htaccess: 尝试将其称为jpg(在htaccess中添加:
RewriteEngine on
RewriteRule image.jpg your_script.php [L]
) )
don't forgot to change your_script.php
and image.jpg
不要忘记更改
your_script.php
和image.jpg
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