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header(\"Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0\"); \/\/ HTTP\/1.1\r\nheader(\"Expires: Sat, 26 Jul 1997 05:00:00 GMT\"); \/\/ Date in the past\r\nheader(\"Pragma: no-cache\"); \/\/ Date in the past<\/pre>\n\u800c\u4e14\u5728\u8bbe\u7f6e\u7684\u65f6\u5019\u8fd8\u5f97\u6ce8\u610f\u5728header\u524d\u4e0d\u80fd\u6709\u8f93\u51fa\uff0c\u5426\u5219header\u8bbe\u7f6e\u65e0\u6548\uff0c\u4f46\u90fd\u6ca1\u6709\u5199\u8fc7\uff0c\u5982\u4f55\u7ed9\u9875\u9762\u8bbe\u7f6eCache\uff0c\u867d\u7136\u6211\u4eec\u77e5\u9053\u6709\u4e00\u4e9b\u529e\u6cd5\uff0c\u6bd4\u5982 E-TAG\u4e4b\u7c7b\u7684\u3002\u5f53\u7136\u4e5f\u6709\u7b80\u5355\u7684\u8bbe\u7f6e\uff1a<\/p>\n
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$seconds_to_cache = 3600;\r\n$ts = gmdate(\"D, d M Y H:i:s\", time() + $seconds_to_cache) . \" GMT\";\r\nheader(\"Expires: $ts\"); header(\"Pragma: cache\");\r\nheader(\"Cache-Control: max-age=$seconds_to_cache\");<\/pre>\n\u7f13\u5b581\u5c0f\u65f6\uff0c\u4e3b\u8981\u662f\u8fc7\u671f\u65f6\u95f4\u5f97\u7528gmdate\u6765\u8bbe\u7f6e\uff0c\u800c\u4e0d\u662fdate\uff0c\u8fd9\u4e2a\u8981\u6ce8\u610f\uff0c\u5176\u4ed6\u90fd\u5dee\u4e0d\u591a\u3002maxage\u8981\u548cexpire\u80fd\u591f\u5bf9\u5f97\u4e0a\u3002<\/p>\n
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