adhocore/cron-expr

Ultra lightweight Cron Expression parser for PHP

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1.1.3 2021-10-20 07:43 UTC

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Last update: 2021-11-13 05:33:13 UTC


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  • Lightweight Cron expression parser library for PHP.
  • Zero dependency.
  • Very fast because it bails early in case a segment doesnt match.
  • Real benchmark shows it is about 7.54x to 12.92x faster than dragonmantank/cron-expression

Installation

composer require adhocore/cron-expr

# PHP5.6 or lower
composer require adhocore/cron-expr:0.1.0

Usage

Basic

use Ahc\Cron\Expression;
use Ahc\Cron\Normalizer;

Expression::isDue('@always');
Expression::isDue(Normalizer::HOURLY, '2015-01-01 00:00:00');
Expression::isDue('*/20 * * * *', new DateTime);
Expression::isDue('5-34/4 * * * *', time());

// Dont like static calls? Below is possible too!
$expr = new Expression;
$expr->isCronDue('*/1 * * * *', time());

Bulk checks

When checking for several jobs at once, if more than one of the jobs share equivalent expression then the evaluation is done only once per go thus greatly improving performnce.

use Ahc\Cron\Expression;

$jobs = [
    'job1' => '*/2 */2 * * *',
    'job1' => '* 20,21,22 * * *',
    'job3' => '7-9 * */9 * *',
    'job4' => '*/5 * * * *',
    'job5' => '@5minutes',     // equivalent to job4 (so it is due if job4 is due)
    'job6' => '7-9 * */9 * *', // exact same as job3 (so it is due if job3 is due)
];

// The second param $time can be used same as above: null/time()/date string/DateTime
$dues = Expression::getDues($jobs, '2015-08-10 21:50:00');
// ['job1', 'job4', 'job5']

// Dont like static calls? Below is possible too!
$expr = new Expression;
$dues = $expr->filter($jobs, time());

Cron Expression

Cron expression normally consists of 5 segments viz:

<minute> <hour> <day> <month> <weekday>

and sometimes there can be 6th segment for <year> at the end.

Real Abbreviations

You can use real abbreviations for month and week days. eg: JAN, dec, fri, SUN

Tags

Following tags are available and they are converted to real cron expressions before parsing:

  • @yearly or @annually - every year
  • @monthly - every month
  • @daily - every day
  • @weekly - every week
  • @hourly - every hour
  • @5minutes - every 5 minutes
  • @10minutes - every 10 minutes
  • @15minutes - every 15 minutes
  • @30minutes - every 30 minutes
  • @always - every minute

You can refer them with constants from Ahc\Cron\Normalizer like Ahc\Cron\Normalizer::WEEKLY

Modifiers

Following modifiers supported

  • Day of Month / 3rd segment:
    • L stands for last day of month (eg: L could mean 29th for February in leap year)
    • W stands for closest week day (eg: 10W is closest week days (MON-FRI) to 10th date)
  • Day of Week / 5th segment:
    • L stands for last weekday of month (eg: 2L is last monday)
    • # stands for nth day of week in the month (eg: 1#2 is second sunday)

LICENSE

© MIT | 2017-2019, Jitendra Adhikari

Credits

This project is release managed by please.