# swoole_process->push 投遞數據到消息隊列中。 ```php bool swoole_process->push(string $data); ``` * $data要投遞的數據，長度受限與操作系統內核參數的限制。默認為8192，最大不超過65536 * 操作失敗會返回false，成功返回true * 默認模式下（阻塞模式），如果隊列已滿，`push`方法會阻塞等待 * 非阻塞模式下，如果隊列已滿，`push`方法會立即返回false 示例 ```php $workers = []; $worker_num = 2; for($i = 0; $i < $worker_num; $i++) { $process = new swoole_process('callback_function', false, false); $process->useQueue(); $pid = $process->start(); $workers[$pid] = $process; //echo "Master: new worker, PID=".$pid."\n"; } function callback_function(swoole_process $worker) { //echo "Worker: start. PID=".$worker->pid."\n"; //recv data from master $recv = $worker->pop(); echo "From Master: $recv\n"; sleep(2); $worker->exit(0); } foreach($workers as $pid => $process) { $process->push("hello worker[$pid]\n"); } for($i = 0; $i < $worker_num; $i++) { $ret = swoole_process::wait(); $pid = $ret['pid']; unset($workers[$pid]); echo "Worker Exit, PID=".$pid.PHP_EOL; } ```