Title: Plugin not listed
Last modified: August 20, 2016

---

# Plugin not listed

 *  Resolved [Patrick Nießen](https://wordpress.org/support/users/hovida/)
 * (@hovida)
 * [14 years, 7 months ago](https://wordpress.org/support/topic/plugin-not-listed/)
 * A simple Plugin did’nt work on Version 3.2.1 and 3.3.
 * **Step 1:**
    Create the Plugin directory with the name “plugin-references” on
   _wp-content/plugins/_
 * **Step 2:**
    Create the Main-File of the Plugin with the name “plugin-references.
   php” on _wp-content/plugins/plugin-references/_
 * **Step 3:**
    Fill the Plugin-File with content:
 *     ```
       <?php
       	/*
       		Plugin Name: Plugin Reference
       		Plugin URI: http://hovida-design.de/
       		Version: 1.0
       		Author: Adrian Preuß
       		Author URI: mailto:a.preuss@hovida-design.de
       	*/
   
       	function plugin_reference($content) {
       		$content = str_replace("[plugin-reference]", "Hello, iam the Plugin!", $content);
       		return $content;
       	}
   
       	add_filter('the_content', 'plugin_reference');
       ?>
       ```
   
 * **Step 4:**
    Activate Plugin,..
 * The Plugin can’t be activated. The Plugin are not on the Plugin-List in the Administration.
 * On Frontend (if WP-Debug on) give PHP a error/warning:
    Warning: **call_user_func_array()**
   expects parameter 1 to be a valid callback, no array or string given in **/\*\*\*\*/
   wp-includes/plugin.php on line 170 **

The topic ‘Plugin not listed’ is closed to new replies.

 * In: [Hacks](https://wordpress.org/support/forum/plugins-and-hacks/hacks/)
 * 0 replies
 * 1 participant
 * Last reply from: [Patrick Nießen](https://wordpress.org/support/users/hovida/)
 * Last activity: [14 years, 7 months ago](https://wordpress.org/support/topic/plugin-not-listed/)
 * Status: resolved

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