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71 lines
2.6 KiB
Markdown
71 lines
2.6 KiB
Markdown
PHP Cron Expression Parser
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==========================
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[](https://packagist.org/packages/mtdowling/cron-expression) [](https://packagist.org/packages/mtdowling/cron-expression) [](http://travis-ci.org/mtdowling/cron-expression)
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The PHP cron expression parser can parse a CRON expression, determine if it is
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due to run, calculate the next run date of the expression, and calculate the previous
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run date of the expression. You can calculate dates far into the future or past by
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skipping n number of matching dates.
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The parser can handle increments of ranges (e.g. */12, 2-59/3), intervals (e.g. 0-9),
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lists (e.g. 1,2,3), W to find the nearest weekday for a given day of the month, L to
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find the last day of the month, L to find the last given weekday of a month, and hash
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(#) to find the nth weekday of a given month.
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Installing
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==========
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Add the dependency to your project:
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```bash
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composer require mtdowling/cron-expression
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```
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Usage
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=====
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```php
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<?php
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require_once '/vendor/autoload.php';
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// Works with predefined scheduling definitions
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$cron = Cron\CronExpression::factory('@daily');
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$cron->isDue();
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echo $cron->getNextRunDate()->format('Y-m-d H:i:s');
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echo $cron->getPreviousRunDate()->format('Y-m-d H:i:s');
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// Works with complex expressions
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$cron = Cron\CronExpression::factory('3-59/15 2,6-12 */15 1 2-5');
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echo $cron->getNextRunDate()->format('Y-m-d H:i:s');
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// Calculate a run date two iterations into the future
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$cron = Cron\CronExpression::factory('@daily');
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echo $cron->getNextRunDate(null, 2)->format('Y-m-d H:i:s');
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// Calculate a run date relative to a specific time
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$cron = Cron\CronExpression::factory('@monthly');
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echo $cron->getNextRunDate('2010-01-12 00:00:00')->format('Y-m-d H:i:s');
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```
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CRON Expressions
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================
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A CRON expression is a string representing the schedule for a particular command to execute. The parts of a CRON schedule are as follows:
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* * * * * *
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- - - - - -
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| | | | | |
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| | | | | + year [optional]
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| | | | +----- day of week (0 - 7) (Sunday=0 or 7)
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| | | +---------- month (1 - 12)
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| | +--------------- day of month (1 - 31)
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| +-------------------- hour (0 - 23)
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+------------------------- min (0 - 59)
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Requirements
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============
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- PHP 5.3+
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- PHPUnit is required to run the unit tests
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- Composer is required to run the unit tests |