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                # swoole_server->defer 延后執行一個PHP函數。Swoole底層會在`EventLoop`循環完成后執行此函數。此函數的目的是為了讓一些PHP代碼延后執行,程序優先處理IO事件。底層不保證`defer`的函數會立即執行,如果是系統關鍵邏輯,需要盡快執行,請使用`after`定時器實現。 ```php function swoole_server->defer(callable $callback); ``` * defer函數的別名是`swoole_event_defer` * `$callback`為可執行的函數變量,可以是字符串、數組、匿名函數 * 在`onWorkerStart`回調中執行`defer`時,必須要等到有事件發生才會回調 > defer函數在swoole-1.8.0或更高版本可用 使用實例 ---- ```php function query($server, $db) { $server->defer(function() use ($db) { $db->close(); }); } ```
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