Rhyous

It is pretty easy to roll out a WordPress plugin that adds a content filter.

Creating a WordPress content filter plugin

Here are the basic steps to replace the content with a filter. This example is very rudimentary and replaces all of the content, which you would probably never really do.

1. Create a new file called MyPlugin.php
2. Add this code:

   <?php
   /*
   Plugin Name: <Your Plugin Name>
   Version: 1.0
   Plugin URI: tba
   Description:
   Author: <your name>
   Author URI: <your web site>
   */
   
     function handleContentFilter( $content = null ) {
       return "Hello, World!";
     }
   
     $test = add_filter( "the_content", "handleContentFilter" );
   
   ?>
   

3. Upload (or copy) MyPlugin.php to the /wp-content/plugins/ directory in your WordPress install.

Replace content based on a search string

This is more likely what you are going to do. Sames steps as above, but change the file as follows:

  function handleContentFilter( $content = null ) {
    return str_replace("FindMe","Hello, World!", $content);
  }

Using a WordPress shortcode plugin

1. Start a new Post
2. type in the following:

   FindMe

3. Click Preview.

Your post should have replaced FindMe with “Hello, Word!”.

A better WordPress content filter plugin template

While the above is all you need, a more scalable solution might involve using classes. Here is a template that uses classes.

<?php
/*
Plugin Name: <Your Plugin Name>
Version: 1.0
Plugin URI: tba
Description:
Author: <your name>
Author URI: <your web site>
*/

// A class to manage your plugin
class MyPlugin {
 
  public function MyPlugin( $shortCodeHandler ) {
    $result = add_filter( 'the_content', array( $shortCodeHandler, 'handleContentFilter' ) );
  }
 
}
 
// A class to handle your shortcode
class ContentFilterHandler {
 
  public function handleContentFilter( $content = null ) {
    return str_replace("FindMe","Hello, World", $content);
  }
 
}
 
$contentFilterHandler  = new ContentFilterHandler();
$plugin = new MyPlugin( $contentFilterHandler  );

?>

It is pretty easy to roll out a WordPress plugin that adds a shortcode.

Creating a WordPress shortcode plugin

Here are the basic steps:

1. Create a new file called MyPlugin.php
2. Add this code:

   <?php
   /*
   Plugin Name: <Your Plugin Name>
   Version: 1.0
   Plugin URI: tba
   Description:
   Author: <your name>
   Author URI: <your web site>
   */
   
     function handleShortcode( $atts, $content ) {
       return "Hello, World!";
     }
   
     $test = add_shortcode( 'my-shortcode', 'handleShortcode' );
   
   ?>
   

3. Upload (or copy) MyPlugin.php to the /wp-content/plugins/ directory in your WordPress install.

Using a WordPress shortcode plugin

1. Start a new Post
2. type in the following:

   [my-shortcode]

3. Click Preview.

Your post should have replaced your shortcode with “Hello, Word!”.

A better WordPress shortcode plugin template

While the above is all you need, a more scalable solution might involve using classes. Here is a template that uses classes.

<?php
/*
Plugin Name: <Your Plugin Name>
Version: 1.0
Plugin URI: tba
Description:
Author: <your name>
Author URI: <your web site>
*/

// A class to manage your plugin
class MyPlugin {
 
  public function MyPlugin( $shortCodeHandler ) {
    $result = add_shortcode( 'my-shortcode', array( $shortCodeHandler, 'handleShortcode' ) );
  }
 
}
 
// A class to handle your shortcode
class ShortCodeHandler {
 
  public function handleShortcode( $atts, $content ) {
    return "Hello, World";
  }
 
}
 
$shortCodeHandler = new ShortCodeHandler();
$plugin = new MyPlugin( $shortCodeHandler );

?>