仅在网页上显示时在 php 中临时存储图像 [英] Temporary store image in php only while displaying on web page
问题描述
我想从其他站点获取图像并在我的站点上显示.我只想在页面上显示时将该图像临时存储在我的身边，以便用户认为图像来自我的网站.这可能吗?如何?提前致谢.
I want to fetch images from other site and display on my site. I want to store that images in my side temporary only at time of showing on page , so that user think images are coming from my site.is it possible? How? Thanks in advance.
例如:-想象一下，在服务器中生成了一些图表(一些网络监控图表，如吸烟)，这些图表以 .png 格式存储在文件夹中.
ex:-
imagine there are some graphs generated in a server (some network monitoring graphs like smokeping )and those graphs are stored in a folder as .png format.
例如:- imagine_this_url_has_a_graph(但这是只是一个页面)
ex:- imagine_this_url_has_a_graph (but this is just a page)
以便用户希望在另一个网站上显示这些图表.
so that user want to show those graphs in another web site.
推荐答案
一个简单的缓存系统就可以做到这一点.给定一个 HTML 文件，例如:
A simple caching system would do this. Given an HTML file like:
<body>
<img src="imagesource.php?file=1" />
</body>
您可以像这样创建图像数据源 (imagesource.php):
You could create your image data source (imagesource.php) like:
<?php
$files = array(
'http://somesite.com/image_to_cache.gif',
'http://somesite.com/image_to_cache2.gif'
);
if(!isset($_REQUEST['file']) || !isset($files[$_REQUEST['file']])) {
header('HTTP/1.0 404 Not Found');
exit;
}
// do we already have the cached file?
$requested_file = $files[$_REQUEST['file']];
$cache_dir = '/tmp/cached_images';
$cache_file = md5($requested_file);
$cache_path = $cache_dir . '/' . $cache_file;
header('Content-Type: image/gif');
if(file_exists($cache_path)) {
readfile($cache_path);
exit;
}
//need to create the cache.
$data = file_get_contents($requested_file);
file_put_contents($cache_path, $data);
echo $data;
如果远程图像尚未下载，这将在本地缓存它们，并在请求时将它们输出到浏览器.
This would cache the remote images locally if they haven't already been downloaded, and output them to the browser when requested.
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