### Install via Composer

Source: https://github.com/dragonmantank/cron-expression/blob/master/README.md

Add the dragonmantank/cron-expression library to your PHP project using Composer. This command fetches and installs the latest stable version.

```bash
composer require dragonmantank/cron-expression
```

--------------------------------

### Cron Expression Example

Source: https://github.com/dragonmantank/cron-expression/blob/master/README.md

Demonstrates a specific cron expression syntax for scheduling tasks on the last Sunday of every month.

```cron
* * * * 7L
```

--------------------------------

### Basic Cron Expression Usage

Source: https://github.com/dragonmantank/cron-expression/blob/master/README.md

Demonstrates how to instantiate the CronExpression parser with predefined schedules like '@daily' and calculate the next and previous run dates. It also shows parsing complex cron strings.

```php
<?php

require_once '/vendor/autoload.php';

// Works with predefined scheduling definitions
$cron = new Cron\CronExpression('@daily');
$cron->isDue();
echo $cron->getNextRunDate()->format('Y-m-d H:i:s');
echo $cron->getPreviousRunDate()->format('Y-m-d H:i:s');

// Works with complex expressions
$cron = new Cron\CronExpression('3-59/15 6-12 */15 1 2-5');
echo $cron->getNextRunDate()->format('Y-m-d H:i:s');

// Calculate a run date two iterations into the future
$cron = new Cron\CronExpression('@daily');
echo $cron->getNextRunDate(null, 2)->format('Y-m-d H:i:s');

// Calculate a run date relative to a specific time
$cron = new Cron\CronExpression('@monthly');
echo $cron->getNextRunDate('2010-01-12 00:00:00')->format('Y-m-d H:i:s');

```

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