WordPress – Making a Facebook plugin
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WordPress has a lot of plugins. but sometimes we would like add your custom functions to wordpress.
For these functions we can create a new plugin.
We must write our plugin using WordPress hooks and PHP language.
We must activate the plugin , so wordpress runs it when the site is loaded. The process is similar to childtheming.
First step – create a folder
Create a folder inside /wp-content /plugins/
For example, /my-facebook-plugin
Step Two – Create a php file
Inside your new folder -created in the first step – with your favorite text editor, create the file my-facebook-plugin.php
The header defines wordpress plugin information used in the administration menu
Plugin Name: My Facebook plugin
Description: My first plugin
Author: My name
Version: 1.0
Plugin URI: www.yourwebsite.com/plugin
*/
The lines are displayed in the wordpress themes menu. Now you can activate the theme in admin panel.
Step Three – Create a function
We need to write a function with our custom code .
{
global $post;
$link= js_escape(get_permalink($post->ID));
// agregar el contenido del post para el return
$content = $post ->post_content;
$button = '<iframe src="http://www.facebook.com/plugins/like.php?href='. $link . '&\
;layout=button_count&show_faces=true&action=like&colorscheme=light&" styl\
e="overflow:hidden;width:100%;height:80px;" scrolling="no" frameborder="0" allowTranspar\
ency="true"></iframe>';
return $button . $content ;
}
I will explain the code
1) This line defines our new function , it will give back the post content , in the var $content
This line, calls the global variable $post, this var has the post content and a lot of information.
This links leaves you to the main reference for this var :
Here , I list some of the most important contents in $post variable:
http://codex.wordpress.org/Function_Reference/$post
ID
(integer) The post ID.
post_author
(integer) The ID of the post author.
post_date
(string) The post date using the server’s current timezone. Format: yyyy-mm-dd hh:mm:ss Example: 2011-05-19 13:51:21 (default Unix format ‘F j, Y’)
post_content
(string) The post content.
post_title
(string) The post’s title.
post_excerpt
(string) The post’s excerpt, if one is set.
post_name
(string) The post’s slug.
post_modified
(string) Date the post was last modified using server’s timezone.
post_parent
(integer) ID of the post’s parent, if it has one.
post_type
(string) The post type.
comment_count
(integer) The number of approved comments.
You can easily get the value , see the next example:
global $post;
echo $post->post_title;
?>
Here, echo prints out the post_title.
The next line, get the page permalink using the function get_permalink pointing to $post->ID .
Then format the permalink using js_escape and stores the result in the var $link
The next line get the post content and stores it in the variable $content
The next and long line , calls the facebook API. and adds our page link using the variable $link.
The facebook code adds the button and the formatting.
Then everything is stored in the variable $button
Finally , we return the button and the post content. Button comes first.
But this function will not work until we use a hook
We must add the next line to tell wordpress to apply the function to every post.
When activate the plugin, in every post we shall see the like button:
Written by Ariel Campos
