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                # Process::wait [TOC] 回收結束運行的子進程。 ~~~ array Process::wait(bool $blocking = true); $result = array('code' => 0, 'pid' => 15001, 'signal' => 15); ~~~ * `$blocking`參數可以指定是否阻塞等待,默認為阻塞 * 操作成功會返回一個數組包含子進程的`PID`、退出狀態碼、被哪種信號`KILL` * 失敗返回`false` > 子進程結束必須要執行wait進行回收,否則子進程會變成僵尸進程 > `$blocking`僅在1.7.10以上版本可用 > 使用`Process`作為監控父進程,創建管理子進程時,父類必須注冊信號`SIGCHL`D對退出的進程執行`wait`,否則子進程一旦被`kill`會引起父進程退出 ## 在異步信號回調中執行wait ~~~ Process::signal(SIGCHLD, function($sig) { //必須為false,非阻塞模式 while($ret = Process::wait(false)) { echo "PID={$ret['pid']}\n"; } }); ~~~ * 信號發生時可能同時有多個子進程退出 * 必須循環執行`wait`直到返回`false`
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