如何执行大型 PHP 脚本？

How to execute a large PHP Script?

提问by Atif Mohammed Ameenuddin

Well basically I may want to execute a script that may take as much as 1 hours as well.

嗯，基本上我可能想要执行一个可能需要 1 小时之多的脚本。

What I really want to do is Send SMS to my users using a third party API. So its basically like I supply my script with an array of phone numbers and fire the method to send SMS.

我真正想做的是使用第三方 API 向我的用户发送短信。所以它基本上就像我为我的脚本提供了一系列电话号码并触发发送短信的方法。

However assuming it take 5 seconds to send 1 SMS and I want to send 1000 SMS which is roughly 1 - 2 hours. I can't use set_time_limit()because I am on shared host.

但是，假设发送 1 条短信需要 5 秒，而我想发送 1000 条短信，大约需要 1 - 2 小时。我无法使用，set_time_limit()因为我在共享主机上。

One way to do this is store numbers in a session and execute each SMS and use javascript to refresh that page until end. This way I need to keep my browser open and the execution will stop if my Internet Connection is disconnected.

一种方法是在会话中存储数字并执行每个 SMS 并使用 javascript 刷新该页面直到结束。这样我需要保持浏览器打开，如果我的 Internet 连接断开，执行将停止。

So, Is there any better way to do this ?

那么，有没有更好的方法来做到这一点？

Hope I am clear enough to explain what I want? I want to execute a large script that may take hours to execute without getting timeout.

希望我足够清楚地解释我想要什么？我想执行一个可能需要数小时才能执行的大型脚本而不会超时。

采纳答案by Mathew

If your host lets you, cron jobs are the best solution. A cron job is basically a normal php script that is automatically run by the web server at a specific time interval. For your needs I would create a script that runs every 5 mins and processes your numbers in batches of 100 (obviously you'll want to tweak the time interval and batch size to suit). This will keep your server load down and prevent you getting in trouble with your hosting provider for hogging resources.

如果您的主机允许，cron 作业是最好的解决方案。cron 作业基本上是一个普通的 php 脚本，由 web 服务器在特定的时间间隔自动运行。根据您的需要，我将创建一个脚本，每 5 分钟运行一次，并以 100 个为一组处理您的数字（显然您需要调整时间间隔和批量大小以适应）。这将降低您的服务器负载，并防止您因占用资源而与您的托管服务提供商发生麻烦。

In order to track which batch your script should be processing, I would setup a track_batch table. These columns should give you a good indication of how to approach the problem:

为了跟踪您的脚本应该处理哪个批次，我将设置一个 track_batch 表。这些列应该可以很好地说明如何解决问题：

id, date_run, start_record, end_record, final_run

id、date_run、start_record、end_record、final_run

Essentially:

本质上：

• Check to see the date of the last batch run. If it isn't the current date (or whatever other identifier you choose to use) for the current batch, then proceed.
• If the last batch run wasfor the current date, then check the final_run column to see whether you've already finished processing all the numbers.
• If you still have numbers to process, use the start and end records in conjunction with MySQL's LIMIT to build the db query that your script will use to get the next batch.
• Process your numbers.
• Store all the info from this batch in the track_batch table.
• If the amount of numbers the query returns is ever less than the maximum batch size, you've reached the end and can set the final_run column to 1.

• 检查以查看上次批处理运行的日期。如果它不是当前批次的当前日期（或您选择使用的任何其他标识符），则继续。
• 如果上次批处理是针对当前日期的，则检查 final_run 列以查看您是否已完成处理所有数字。
• 如果您仍有要处理的数字，请将开始和结束记录与 MySQL 的 LIMIT 结合使用来构建您的脚本将用于获取下一批的数据库查询。
• 处理您的号码。
• 将此批次的所有信息存储在 track_batch 表中。
• 如果查询返回的数字量永远小于最大批量大小，则您已到达末尾并且可以将 final_run 列设置为 1。

Once you've got your script, you'll need to setup the cron job itself. Shared hosts are likely to have their own custom interfaces for doing this, so they are probably the best people to ask once you've got your script working.

获得脚本后，您需要自行设置 cron 作业。共享主机可能有自己的自定义界面来执行此操作，因此一旦您的脚本工作，他们可能是最好的询问人。

回答by Bill Karwin

A PHP script executed from the command-line or from a shell script, cron job, etc. does not have a timeout.

从命令行或 shell 脚本、cron 作业等执行的 PHP 脚本没有超时。

For CLI-invoked scripts, even if you set the PHP script's timeout dynamically with the set_time_limit()function, it has no effect.

对于 CLI 调用的脚本，即使您使用该set_time_limit()函数动态设置 PHP 脚本的超时，也没有任何效果。

回答by Your Common Sense

PHP scripts running from the command line aren't affected by max_execution_timeoption.
So you don't have to worry at all.

从命令行运行的 PHP 脚本不受max_execution_time选项的影响。
所以你完全不用担心。

回答by Seb

It's not the best options to use set_time_limit(0), because that'd means it'll run indefinitely even if you have a bug and your script enters an infinite loop.

这不是使用的最佳选择set_time_limit(0)，因为这意味着即使您有错误并且脚本进入无限循环，它也会无限期地运行。

Instead, if you estimate each SMS is going to take 5 seconds, use this approach:

相反，如果您估计每条 SMS 将花费 5 秒，请使用以下方法：

while( $there_are_more_sms_to_be_sent ){
  set_time_limit(30); // enough spare time, just in case.

  // Do your sending, blah blah
}

That way, the time limit will be sequentially updated to 30 seconds. Of course you might have the infinite loop problem with that single while, but if you have other calls inside that whilethat limit will prevent thosecalls to be to blame.

这样，时间限制将依次更新为 30 秒。当然，您可能会遇到那个 single 的无限循环问题while，但是如果您在while该限制内有其他调用，则会阻止这些调用受到指责。

回答by Thiago Belem

You canor you can'tuse set_time_limit()?

你能用还是不能用set_time_limit()？

If you can.. Use it:

如果可以的话..使用它：

<?php
// Runs forever and ever...
set_time_limit(-1);
?>

回答by Matijs

An alternative to using JavaScript is to add the Refreshmeta tag to your page:

使用 JavaScript 的替代方法是将Refresh元标记添加到您的页面：

<meta http-equiv="Refresh" content="2; url=http://yoururl/script.php&step=x" ?>

The two in content="2; url=..tells the browser to load the url 2 second after the page has loaded.

两个 incontent="2; url=..告诉浏览器在页面加载后 2 秒加载 url。

回答by Gabriel Sosa

IN THE CASE YOU CAN RUN CRON JOBS

如果您可以运行 CRON 作业

I usually have a queue, a manager and workers. Unless you can call the sms api once at the time this model can help you, and you souldn't worry about timeouts since each worker will manage it selves.

我通常有一个队列，一个经理和一个工人。除非您可以在这个模型可以帮助您的时候调用一次 sms api，并且您不必担心超时，因为每个工作人员都会自行管理它。

I have something like:

我有类似的东西：

<?php
// PSEUDO CODE
// grab pending from queue

// <for> {
// update to running
exec("/usr/bin/php /path/to/send.php {$id} > /dev/null &");
// }

and send.php will send each sms. Right now I have this running at a rate of 300/minute since is the max frequency that you can setup on a cron job

和 send.php 将发送每条短信。现在我以 300/分钟的速度运行，因为这是您可以在 cron 作业上设置的最大频率