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                例子 1 更改瀏覽器的默認緩存設置 ~~~ // Date in the past header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Cache-Control: no-cache"); header("Pragma: no-cache"); ?> <-html-> <-body-> ... ... ~~~ 注釋:用戶可能會設置一些選項來更改瀏覽器的默認緩存設置。通過發送上面的報頭,您可以覆蓋任何這些設置,強制瀏覽器不進行緩存! 例子 2 提示用戶保存一個生成的 PDF 文件(Content-Disposition 報頭用于提供一個推薦的文件名,并強制瀏覽器顯示保存對話框): ~~~ <?php header("Content-type:application/pdf"); // 文件將被稱為 downloaded.pdf header("Content-Disposition:attachment;filename='downloaded.pdf'"); // PDF 源在 original.pdf 中 readfile("original.pdf"); ?> <html> <body> ... ... ~~~ 注釋:微軟 IE 5.5 存在一個阻止以上機制的 bug。通過升級為 Service Pack 2 或更高的版本,可以解決該 bug。
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