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How do I call functions from my plugin in a WP template?

I created a calendar plugin and now I want to show a list of events in one of my templates. The code I'm using now is this:

include_once(WP_CAL_PLUGIN_DIR.'eventcal.class.php');

$calendar = new EventCalendar();
$events = $calendar->getMultipleEvents('5');

(...)

<table>
<?php foreach($events as $event) : ?>
  <tr>
    <td><span><?php echo $calendar->formatEventTime($event->startTime,'dm'); ?></span></td>
    <td><span><?php echo $calendar->formatEventTime($event->startTime,'time'); ?></span></td>
    <td><?php echo $event->name; ?></td>
  </tr>
<?php endforeach; ?>
</table>

Is there a way that I can call functions inside my plugin without having to enable the WP plugin and create a new instance of the class?

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2 answers

To execute short code inside a template, use the function do_shortcode('[my-shortcode-handle]'). Your shortcode must be registered as normal ( see the WordPress codex on the shortcode API ) before you can use it in the template. Any attributes inside the content, etc. Must also be there.

echo do_shortcode( '[my-shortcode foo="bar"]Shortcode content[/my-shortcode]' );

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: http://codex.wordpress.org/Plugin_API

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add_action ( 'hook_name', 'your_function_name', [priority], [accepted_args] );

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add_action ( 'publish_post', 'email_friends' );
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