├── readme.md
└── src
    └── WP_Cron.php


/readme.md:
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 1 | # WP_Cron
 2 | 
 3 | 
 4 | ### Clean API into WordPress's Cron System
 5 | WP_Cron is a simple and easy to use class for defining cron events in WordPress. Simply, define a class extending WP_Cron, set the frequency of the cron event using the $every property and then write the code you want to execute in the handle() method.
 6 | 
 7 | 
 8 | ```php
 9 | <?php
10 | 
11 | Class UpdateLondonWeather extends WP_Cron{
12 | 
13 |     public $every = [
14 |         'seconds'   => 30,
15 |         'minutes'   => 15,
16 |         'hours'     => 1,
17 |     ];
18 |     
19 |     public function handle(){
20 |         $response = file_get_contents('http://api.openweathermap.org/data/2.5/weather?id=2172797');
21 |         $json     = json_decode($response);
22 |         if($json === NULL && json_last_error() !== JSON_ERROR_NONE){
23 |             return;
24 |         }
25 |         if(isset($json->weather[0]->description)){
26 |             update_option('london_weather', $json->weather[0]->description);
27 |         }
28 |     }
29 | }
30 | 
31 | UpdateLondonWeather::register();
32 | ```
33 | 


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/src/WP_Cron.php:
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 1 | <?php
 2 | 
 3 | Class WP_Cron{
 4 | 
 5 | 	public function slug(){
 6 | 		$reflect = new ReflectionClass($this);
 7 | 		$class = $reflect->getShortName();
 8 | 		return 'wp_cron__'. strtolower($class); 
 9 | 	}
10 | 
11 | 	public function schedule(){		
12 | 		return 'schedule_'. $this->slug();
13 | 	}
14 | 
15 | 	public function calculateInterval(){
16 | 
17 | 		if(!is_array($this->every)){
18 | 			throw new Exception("Interval must be an array");
19 | 		}
20 | 
21 | 		if(!(count(array_filter(array_keys($this->every), 'is_string')) > 0)){
22 | 			throw new Exception("WP_Cron::\$interval must be an assoc array");
23 | 		}
24 | 		
25 | 		$interval = 0;
26 | 		$multipliers = array(
27 | 			'seconds' 	=> 1,
28 | 			'minutes' 	=> 60,
29 | 			'hours' 	=> 3600,
30 | 			'days' 		=> 86400,
31 | 			'weeks' 	=> 604800,
32 | 			'months' 	=> 2628000,
33 | 		);
34 | 
35 | 		foreach($multipliers as $unit => $multiplier){
36 | 			if(isset($this->every[$unit]) && is_int($this->every[$unit])){
37 | 				$interval = $interval + ($this->every[$key] * $multiplier);
38 | 			}
39 | 		}
40 | 
41 | 		return $interval;
42 | 	}
43 | 
44 | 	public function scheduleFilter($schedules){
45 | 		$interval = $this->calculateInterval();
46 | 
47 | 		if(!in_array($this->schedule(), array_keys($schedules))){
48 | 			$schedules[$this->schedule()] = array(
49 | 				'interval' => $interval,
50 | 				'display'  => 'Every '. floor($interval / 60) .' minutes',
51 | 			);
52 | 		}
53 | 
54 | 		return $schedules;
55 | 	}
56 | 
57 | 	public static function register(){
58 | 		$class = get_called_class();
59 | 		$self  = new $class;
60 | 		$slug  = $self->slug();
61 | 
62 | 		add_filter('cron_schedules', array($self, 'scheduleFilter'));
63 | 
64 | 		if(!wp_next_scheduled($slug)){
65 | 		    wp_schedule_event(time(), $self->schedule(), $slug);
66 | 		}
67 | 
68 | 		if(method_exists($self, 'handle')){
69 | 			 add_action($slug, array($self, 'handle'));
70 | 		}
71 | 	}
72 | }


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