Posts Tagged Filter Function

How to make wordpress plugin: General

Posted by in PHP code, Wordpress plugin on July 21st, 2009

This article will present you with the basics of wordpress plugin. I have create a plugin to help you understand how to create a plugin. This simple plugin shows a digg button to all your post. You can download the full code here. Below is several code I use:

class diggme
{
function diggme() {

add_action(’init’, array($this, ‘init’));
add_action(’admin_menu’, array(&$this, ’setmenu’));
add_filter(’the_content’, array(&$this, ‘the_content_filter’));
}

function init()
{
?>
<link href=”<?php echo get_option(’siteurl’); ?>/wp-content/plugins/diggme/css.css” rel=”stylesheet” type=”text/css” />
<?php
}

function managepage(){
echo “<div id=’setting’>This is setting page. Just ignore this</div>”;
}

function setmenu () {
add_options_page(
‘DiggMe’,
‘DiggMe’,
‘manage_options’,
__FILE__,
array(&$this,’managepage’ ) );
}

function the_content_filter($content)
{
return $this->displaydigg() . $content;
}

function displaydigg()
{
global $post;

return “<div id=\”diggbutton\”><a href=\”http://digg.com/submit?phase=2&amp;url=”.get_permalink($post->ID).”\”><img src=\”".get_settings(’siteurl’).”/wp-content/plugins/diggme/digg.png\”></a></div>”;
}

}

$diggme = new diggme();

  • The code will first create a class called diggme. Every time the plugin loads it will create an object of this class using $diggme = new diggme();

The constructor

  • add_action(’init’, array($this, ‘init’)); -> This will tell your blog to execute function init whenever it loads.
  • add_action(’admin_menu’, array(&$this, ’setmenu’)); -> This will tell your blog to create menu at your admin page. You can place any settings here.
  • add_filter(’the_content’, array(&$this, ‘the_content_filter’)); -> This will be executed every time when your post loads. In this example we will load function the_content_filter every time the page loads, read the post content and add a digg button to the post.

Other function is easy to understand if you have basic PHP skill. If you have any question just comment below.

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