http_cache_last_modified
(PECL pecl_http >= 0.1.0)
http_cache_last_modified — Caching by last modification
說明
$timestamp_or_expires
] )Attempts to cache the sent entity by its last modification date.
If the supplied argument is greater than 0, it is handled as timestamp and will be sent as date of last modification. If it is 0 or omitted, the current time will be sent as Last-Modified date. If it's negative, it is handled as expiration time in seconds, which means that if the requested last modification date is not between the calculated timespan, the Last-Modified header is updated and the actual body will be sent.
A log entry will be written to the cache log if the INI 設定 http.log.cache is set and the cache attempt was successful.
Note: 此函式可與 http_send_data(), http_send_file() 和 http_send_stream() 一同使用。
參數
-
timestamp_or_expires -
Unix timestamp
回傳值
回傳 FALSE 或在成功時回傳出口訊息 with 304 Not Modified if the entity is cached.
要知道“出口”的含意請查閱
INI 設定
http.force_exit。
範例
Example #1 A http_cache_last_modified() example
Caching for 5 seconds.
<?php
http_cache_last_modified(-5);
printf("%s\n", http_date());
?>
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