rend 未定义，是什么原因？

来源：6-3 Swoole进程案例解刨

小白学编程666

2019-01-19

echo "process-start-time:".date('Y-m-d H:i:s').PHP_EOL;
$workers = [];
$curls = [
    'http://baidu.com',
    'http://sina.com.cn',
    'http://qq.com',
    'https://www.baidu.com/s?wd=imooc',
    'https://www.baidu.com/s?wd=wnaglei',
    'https://www.baidu.com/s?wd=wangmin',
];

for ($i=0; $i<6; $i++) {
    $process = new swoole_process(function (swoole_process $worder) use($i, $curls) {
        $content = curlData($curls[$i]);
//        echo $content.PHP_EOL;
        $worder->write($content.PHP_EOL);
    }, true);
    $pid = $process->start();
    $workers[$pid] = $process;
}

foreach ($workers as $process) {
    echo $process->rend();
}

function curlData($curl) {
    sleep(1);
    return $curl.'success'.PHP_EOL;
}

echo "process-end-time:".date('Y-m-d H:i:s').PHP_EOL;

报错：

process-start-time:2019-01-19 04:37:38
PHP Fatal error:  Uncaught Error: Call to undefined method Swoole\Process::rend() in /Users/alanwang/wwwroot/demo/process/curl.php:31
Stack trace:

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