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April 12, 2017 16:08
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Przykład implementacji akcji i filtrów z Wordpressa w PHP
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| <?php | |
| global $actions; | |
| $actions = []; | |
| function add_action($action, $call, $priority = 10){ | |
| global $actions; | |
| if(!isset($actions[$action])){ | |
| $actions[$action] = []; | |
| } | |
| $actions[$action][] = compact('call', 'priority'); | |
| } | |
| function do_action($action){ | |
| global $actions; | |
| if(!isset($actions[$action])){ | |
| return; | |
| } | |
| $to_execute = $actions[$action]; | |
| // Sort by priority | |
| usort($to_execute, function($item1,$item2) { | |
| if ($item1['priority'] == $item2['priority']){ | |
| return 0; | |
| } | |
| return ($item1['priority'] > $item2['priority']) ? 1 : -1; | |
| }); | |
| // var_dump($to_execute); | |
| // Execute all callbacks | |
| foreach ($to_execute as $item) { | |
| call_user_func($item['call']); | |
| } | |
| } | |
| // Core actions | |
| add_action('display_head', function(){ | |
| echo '<title>Testowy tytuł</title>'; | |
| }); | |
| add_action('display_head', function(){ | |
| echo '<meta charset="utf-8">'; | |
| }); | |
| add_action('display_content', function(){ | |
| ?> | |
| <h1>Lorem</h1> | |
| <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Maxime aliquam ea, fugiat ipsum voluptas, saepe temporibus laboriosam labore. Incidunt odio aspernatur quia excepturi iste, architecto nostrum sequi dolorem corporis reprehenderit?</p> | |
| <?php | |
| }); | |
| // Wtyczka 1 - dodaje container wokół tresci | |
| add_action('display_head', function() { | |
| ?> | |
| <style> | |
| .container{ | |
| width: 800px; | |
| margin: 0 auto; | |
| } | |
| </style> | |
| <?php | |
| }); | |
| add_action('display_content', function(){ | |
| echo '<div class="container">'; | |
| }, 9); | |
| add_action('display_content', function(){ | |
| echo '</div>'; | |
| }, 11); | |
| add_action('display_content', function(){ | |
| global $actions; | |
| ?> | |
| <pre><?php var_dump($actions); ?></pre> | |
| <?php | |
| }); | |
| ?> | |
| <?php // Twoja templatka ?> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <?php do_action('display_head'); ?> | |
| </head> | |
| <body> | |
| <?php do_action('display_content'); ?> | |
| </body> | |
| </html> |
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| <?php | |
| global $filters; | |
| $filters = []; | |
| function apply_filters($filter, $data){ | |
| global $filters; | |
| if(!isset($filters[$filter])){ | |
| return ; | |
| } | |
| $to_execute = $filters[$filter]; | |
| // TODO Add sort by priority; | |
| $result = $data; | |
| foreach ($to_execute as $item) { | |
| $result = call_user_func($item['call'], $data); | |
| } | |
| return $result; | |
| } | |
| function add_filter($filter, $call){ | |
| // TODO Add support priority | |
| global $filters; | |
| if(!isset($filters[$filter])){ | |
| $filters[$filter] = []; | |
| } | |
| $filters[$filter][] = compact('call'); | |
| } | |
| // Mechanizm pobierania wpisów z bazy danych i inne | |
| global $posts; | |
| $posts = []; | |
| $posts[1] = ['title' => 'Tytuł', 'content' => '<p>Polska tresc</p>']; | |
| function get_post($id){ | |
| global $posts; | |
| $filtered_id = apply_filters('get_post_id', $id); | |
| return $posts[$filtered_id]; | |
| } | |
| // Wtyczka do obsługi stron wielojezycznych | |
| $posts[1001] = ['title' => 'English', 'content' => '<p>Angielska tresc</p>']; | |
| add_filter('get_post_id', function($id){ | |
| $lang = isset($_GET['lang']) ? $_GET['lang'] : 'pl'; | |
| if($lang === 'pl'){ | |
| return $id; | |
| } | |
| if($id < 1000){ | |
| return $id + 1000; | |
| } | |
| return $id; | |
| }); | |
| ?> | |
| <?php // Pobieranie wpisu o id = 1 ?> | |
| <pre><?php var_dump(get_post(1)); ?></pre> | |
| <?php // Opcja zmiany jezyka ?> | |
| <a href="?lang=pl">Strona polska</a> | |
| <a href="?lang=en">Strona angielska</a> |
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