长PHP脚本运行多次

> max_execution_time已禁用.只要需要,您的脚本将不会在该过程完成之前结束.
> memory_limit已禁用.内存中存储的数据量没有限制.

完成500条记录没有问题.这表明脚本在下一次cronjob迭代之前完成其过程.例如,如果您的cron每小时运行一次,则会在不到一小时的时间内处理500条记录.

如果您有一个将要处理大量记录的cronjob,那么请考虑向该进程添加锁定机制.仅允许脚本运行一次,并在上一个过程完成时重新启动.

在执行php脚本之前,您可以将脚本锁创建为shell脚本的一部分.或者,如果您无法访问服务器,则可以在php脚本中使用数据库锁定,如下所示.

class ProductCronJob
{
    protected $lockValue;

    public function run()
    {
        // Obtain a lock
        if ($this->obtainLock()) {
            // Run your script if you have valid lock
            $this->syncProducts();

            // Release the lock on complete
            $this->releaseLock();
        }
    }

    protected function syncProducts()
    {
        // your long running script
    }

    protected function obtainLock()
    {
        $time = new DateTime;
        $timestamp = $time->getTimestamp();
        $this->lockValue = $timestamp . '_syncProducts';

        $db = JFactory::getDbo();

        $lock = [
            'lock'         => $this->lockValue,'timemodified' => $timestamp
        ];
        // lock = '0' indicate that the cronjob is not active.
        // Update #__cronlock set lock = '',timemodified = '' where name = 'syncProducts' and lock = '0'
//        $result = $db->updateObject('#__cronlock',$lock,'id');

//        $lock = SELECT * FROM #__cronlock where name = 'syncProducts';

        if ($lock !== false && (string)$lock !== (string)$this->lockValue) {
            // Currently there is an active process - can't start a new one

            return false;

            // You can return false as above or add extra logic as below

            // Check the current lock age - how long its been running for
//            $diff = $timestamp - $lock['timemodified'];
//            if ($diff >= 25200) {
//                // The current script is active for 7 hours.
//                // You can change 25200 to any number of seconds you want.
//                // Here you can send notification email to site administrator.
//                // ...
//            }
        }

        return true;
    }

    protected function releaseLock()
    {
        // Update #__cronlock set lock = '0' where name = 'syncProducts'
    }
}