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Informations about the package php-cron-scheduler
PHP Cron Scheduler
This is a framework agnostic cron jobs scheduler that can be easily integrated with your project or run as a standalone command scheduler. The idea was originally inspired by the Laravel Task Scheduling.
Installing via Composer
The recommended way is to install the php-cron-scheduler is through Composer. Please refer to Getting Started on how to download and install Composer.
After you have downloaded/installed Composer, run
php composer.phar require peppeocchi/php-cron-scheduler
or add the package to your composer.json
Scheduler V4 requires php >= 7.3, please use the v3 branch for php versions < 7.3 and > 7.1 or the v2 branch for php versions < 7.1.
How it works
Create a scheduler.php
file in the root your project with the following content.
Then add a new entry to your crontab to run scheduler.php
every minute.
`
That's it! Your scheduler is up and running, now you can add your jobs without worring anymore about the crontab.
Scheduling jobs
By default all your jobs will try to run in background.
PHP scripts and raw commands will run in background by default, while functions will always run in foreground.
You can force a command to run in foreground by calling the inForeground()
method.
Jobs that have to send the output to email, will run foreground.
Schedule a php script
The php
method accepts 4 arguments:
- The path to your php script
- The PHP binary to use
- Arguments to be passed to the script (NOTE: You need to have register_argc_argv enable in your php.ini for this to work (ref). Don't worry it's enabled by default, so unless you've intentionally disabled it or your host has it disabled by default, you can ignore it.)
- Identifier
Schedule a raw command
The raw
method accepts 3 arguments:
- Your command
- Arguments to be passed to the command
- Identifier
Schedule a function
The call
method accepts 3 arguments:
- Your function
- Arguments to be passed to the function
- Identifier
All of the arguments you pass in the array will be injected to your function. For example
If you want to pass a key => value pair, please pass an array within the arguments array
Schedules execution time
There are a few methods to help you set the execution time of your schedules. If you don't call any of this method, the job will run every minute ( *).
-
at
- This method accepts any expression supported by dragonmantank/cron-expression -
everyMinute
- Run every minute. You can optionally pass a$minute
to specify the job runs every$minute
minutes. -
hourly
- Run once per hour. You can optionally pass the$minute
you want to run, by default it will run every hour at minute '00'. daily
- Run once per day. You can optionally pass$hour
and$minute
to have more granular control (or a stringhour:minute
)
There are additional helpers for weekdays (all accepting optionals hour and minute - defaulted at 00:00)
sunday
monday
tuesday
wednesday
thursday
friday
saturday
And additional helpers for months (all accepting optionals day, hour and minute - defaulted to the 1st of the month at 00:00)
january
february
march
april
may
june
july
august
september
october
november
december
You can also specify a date
for when the job should run.
The date can be specified as string or as instance of DateTime
. In both cases you can specify the date only (e.g. 2018-01-01) or the time as well (e.g. 2018-01-01 10:30), if you don't specify the time it will run at 00:00 on that date.
If you're providing a date in a "non standard" format, it is strongly adviced to pass an instance of DateTime
. If you're using createFromFormat
without specifying a time, and you want to default it to 00:00, just make sure to add a !
to the date format, otherwise the time would be the current time. Read more
Send output to file/s
You can define one or multiple files where you want the output of your script/command/function execution to be sent to.
Send output to email/s
You can define one or multiple email addresses where you want the output of your script/command/function execution to be sent to. In order for the email to be sent, the output of the job needs to be sent first to a file. In fact, the files will be attached to your email address. In order for this to work, you need to install swiftmailer/swiftmailer
You can optionally customize the Swift_Mailer
instance with a custom Swift_Transport
.
You can configure:
subject
- The subject of the email sentfrom
- The email address set as senderbody
- The body of the emailtransport
- The transport to use. For example if you want to use your gmail account or any other SMTP account. The value should be an instance ofSwift_Tranport
ignore_empty_output
- If this is set totrue
, jobs that return no output won't fire any email.
The configuration can be set "globally" for all the scheduler commands, when creating the scheduler.
Or can be set on a job per job basis.
Schedule conditional execution
Sometimes you might want to execute a schedule not only when the execution is due, but also depending on some other condition.
You can delegate the execution of a cronjob to a truthful test with the method when
.
Schedules execution order
The jobs that are due to run are being ordered by their execution: jobs that can run in background will be executed first.
Schedules overlapping
To prevent the execution of a schedule while the previous execution is still in progress, use the method onlyOne
. To avoid overlapping, the Scheduler needs to create lock files.
By default it will be used the directory path used for temporary files.
You can specify a custom directory path globally, when creating a new Scheduler instance.
Or you can define the directory path on a job per job basis.
In some cases you might want to run the job also if it's overlapping.
For example if the last execution was more that 5 minutes ago.
You can pass a function as a second parameter, the last execution time will be injected.
The job will not run until this function returns false
. If it returns true
, the job will run if overlapping.
Before job execution
In some cases you might want to run some code, if the job is due to run, before it's being executed.
For example you might want to add a log entry, ping a url or anything else.
To do so, you can call the before
like the example below.
After job execution
Sometime you might wish to do something after a job runs. The then
methods provides you the flexibility to do anything you want after the job execution. The output of the job will be injected to this function.
For example you might want to add an entry to you logs, ping a url etc...
By default, the job will be forced to run in foreground (because the output is injected to the function), if you don't need the output, you can pass true
as a second parameter to allow the execution in background (in this case $output
will be empty).
Using "before" and "then" together
Multiple scheduler runs
In some cases you might need to run the scheduler multiple times in the same script. Although this is not a common case, the following methods will allow you to re-use the same instance of the scheduler.
Another handy method if you are re-using the same instance of the scheduler with different jobs (e.g. job coming from an external source - db, file ...) on every run, is to clear the current scheduled jobs.
Faking scheduler run time
When running the scheduler you might pass an DateTime
to fake the scheduler run time.
The resons for this feature are described here;
Job failures
If some job fails, you can access list of failed jobs and reasons for failures.
Worker
You can simulate a cronjob by starting a worker. Let's see a simple example
The above code starts a worker that will run your job/s every minute.
This is meant to be a testing/debugging tool, but you're free to use it however you like.
You can optionally pass an array of "seconds" of when you want the worker to run your jobs, for example by passing [0, 30]
, the worker will run your jobs at second 0 and at second 30 of the minute.
It is highly advisable that you run your worker separately from your scheduler, although you can run the worker within your scheduler. The problem comes when your scheduler has one or more synchronous job, and the worker will have to wait for your job to complete before continuing the loop. For example
The above will skip more than one execution, so it won't run anymore every minute but it will run probably every 2 or 3 minutes. Instead the preferred approach would be to separate the worker from your scheduler.
Then in your command line run php worker.php
. This will start a foreground process that you can kill by simply exiting the command.
The worker is not meant to collect any data about your runs, and as already said it is meant to be a testing/debugging tool.
License
The MIT License (MIT)