Title: Using OOP and admin_init in Settings>General
Last modified: November 4, 2019

---

# Using OOP and admin_init in Settings>General

 *  [howster](https://wordpress.org/support/users/howster/)
 * (@howster)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/)
 * Hi Guys,
 * The below procedural PHP code will add 5 text fields to Settings>General in the
   WP dashboard but how do I achieve the same with using OOP classes?
 *     ```
       function link_settings_api_init() {
       	// Add the section to general settings so we can add our
       	// fields to it
       	add_settings_section(
       	   'links_setting_section',
       	   'Social Links',
       	   'links_setting_section_callback_function',
       	   'general'
          );
   
       	// Add the field with the names and function to use for our new
       	// settings, put it in our new section
       	add_settings_field(
       	   'facebook_link',
       	   'Facebook Link',
       	   'facebook_function',
       	   'general',
       	   'links_setting_section'
          );
   
          add_settings_field(
       		'twitter_link',
       		'Twitter Link',
       		'twitter_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'linkedin_link',
       		'Linkedn Link',
       		'linkedin_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'instagram_link',
       		'Instagram Link',
       		'instagram_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'youtube_link',
       		'YouTube Link',
       		'youtube_function',
       		'general',
       		'links_setting_section'
       	);
       	// Register our setting so that $_POST handling is done for us and
       	// our callback function just has to echo the <input>
       	register_setting( 'general', 'facebook_link' );
       	register_setting( 'general', 'twitter_link' );
       	register_setting( 'general', 'linkedin_link' );
       	register_setting( 'general', 'instagram_link' );
       	register_setting( 'general', 'youtube_link' );
   
       } // link_settings_api_init()
   
       add_action( 'admin_init', 'link_settings_api_init' );
   
       function links_setting_section_callback_function() {
       	echo '<p>Add Social Media Links for HSPH</p>';
       }
   
       function facebook_function() {
       $facebook_link = get_option( 'facebook_link', '' );
       echo '<input id="facebook_link" style="width: 35%;" type="text" title="Facebook Link" name="facebook_link" value="' . sanitize_text_field($facebook_link) . '" />';
       }
   
       function twitter_function() {
       $twitter_link = get_option( 'twitter_link', '' );
       echo '<input id="twitter_link" style="width: 35%;" type="text" title="Twitter Link" name="twitter_link" value="' . sanitize_text_field($twitter_link) . '" />';
       }
   
       function linkedin_function() {
       $linkedin_link = get_option( 'linkedin_link', '' );
       echo '<input id="linkedin_link" style="width: 35%;" type="text" title="LinkedIn Link" name="linkedin_link" value="' . sanitize_text_field($linkedin_link) . '" />';
       }
   
       function instagram_function() {
       $instagram_link = get_option( 'instagram_link', '' );
       echo '<input id="instagram_link" style="width: 35%;" type="text" title="Instagram Link" name="instagram_link" value="' . sanitize_text_field($instagram_link) . '" />';
       }
   
       function youtube_function() {
       $youtube_link = get_option( 'youtube_link', '' );
       echo '<input id="youtube_link" style="width: 35%;" type="text" title="YouTube Link" name="youtube_link" value="' . sanitize_text_field($youtube_link) . '" />';
       }
       ```
   
 * How do I convert the above to work in PHP OOP
 *     ```
       class MY_Plugin_Social {
   
   
   
       	public function init() {
   
       add_action( 'admin_init', 'link_settings_api_init' );
       // or should I use an array 	add_action( 'admin_init', array( $this, 'link_settings_api_init' ), 99 );
       	}
   
       public function link_settings_api_init() {
       	// Add the section to general settings so we can add our
       	// fields to it
       	add_settings_section(
       	   'links_setting_section',
       	   'Social Links',
       	   'links_setting_section_callback_function',
       	   'general'
          );
   
       	// Add the field with the names and function to use for our new
       	// settings, put it in our new section
       	add_settings_field(
       	   'facebook_link',
       	   'Facebook Link',
       	   'facebook_function',
       	   'general',
       	   'links_setting_section'
          );
   
          add_settings_field(
       		'twitter_link',
       		'Twitter Link',
       		'twitter_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'linkedin_link',
       		'Linkedn Link',
       		'linkedin_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'instagram_link',
       		'Instagram Link',
       		'instagram_function',
       		'general',
       		'links_setting_section'
       	);
   
       	add_settings_field(
       		'youtube_link',
       		'YouTube Link',
       		'youtube_function',
       		'general',
       		'links_setting_section'
       	);
       	// Register our setting so that $_POST handling is done for us and
       	// our callback function just has to echo the <input>
       	register_setting( 'general', 'facebook_link' );
       	register_setting( 'general', 'twitter_link' );
       	register_setting( 'general', 'linkedin_link' );
       	register_setting( 'general', 'instagram_link' );
       	register_setting( 'general', 'youtube_link' );
   
       } // link_settings_api_init()
   
       public function links_setting_section_callback_function() {
       	echo '<p>Add Social Media Links for HSPH</p>';
       }
   
       public function facebook_function() {
       $facebook_link = get_option( 'facebook_link', '' );
       echo '<input id="facebook_link" style="width: 35%;" type="text" title="Facebook Link" name="facebook_link" value="' . sanitize_text_field($facebook_link) . '" />';
       }
   
       public function twitter_function() {
       $twitter_link = get_option( 'twitter_link', '' );
       echo '<input id="twitter_link" style="width: 35%;" type="text" title="Twitter Link" name="twitter_link" value="' . sanitize_text_field($twitter_link) . '" />';
       }
   
       public function linkedin_function() {
       $linkedin_link = get_option( 'linkedin_link', '' );
       echo '<input id="linkedin_link" style="width: 35%;" type="text" title="LinkedIn Link" name="linkedin_link" value="' . sanitize_text_field($linkedin_link) . '" />';
       }
   
       public function instagram_function() {
       $instagram_link = get_option( 'instagram_link', '' );
       echo '<input id="instagram_link" style="width: 35%;" type="text" title="Instagram Link" name="instagram_link" value="' . sanitize_text_field($instagram_link) . '" />';
       }
   
       function youtube_function() {
       $youtube_link = get_option( 'youtube_link', '' );
       echo '<input id="youtube_link" style="width: 35%;" type="text" title="YouTube Link" name="youtube_link" value="' . sanitize_text_field($youtube_link) . '" />';
       }
   
       }
       ```
   
 * I’m getting a callback error similar to Warning: call_user_func() expects parameter
   1 to be a valid callback, function ‘links_setting_section_callback_function’ 
   not found or invalid function name in /home/xyz/code/wwwhsph/wp-admin/includes/
   template.php on line 1608
    -  This topic was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
    -  This topic was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
    -  This topic was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [catacaustic](https://wordpress.org/support/users/catacaustic/)
 * (@catacaustic)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12096667)
 * When you’re using objects, you need to call the function of that object, not 
   jsut the function name, or PHP won’t know what to do – as you’ve seen now.
 * Wrong way:
 * `add_action( 'admin_init', 'link_settings_api_init' );`
 * The correct way to do it is:
 * `add_action( 'admin_init', array ($this, 'link_settings_api_init') );`
 *  Thread Starter [howster](https://wordpress.org/support/users/howster/)
 * (@howster)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12098223)
 * Thanks very much. I added `add_action( 'admin_init', array ($this, 'link_settings_api_init'));`
   and that successfully allows the function `link_settings_api_init()` to execute.
   Now how do I get the other functions like `links_setting_section_callback_function()`
   and `facebook_function()...` to execute. Must I add more add_actions to `public
   function unit()` or add something to `link_settings_api_init()` because I’m getting
   errors like: `Warning: call_user_func() expects parameter 1 to be a valid callback,
   function ‘links_setting_section_callback_function’ not found or invalid function
   name in /home/xyz/code/wwwhsph/wp-admin/includes/template.php on line 1608`
 * …I seem to find lots of info on how to use procedural PHP to do this but OOP 
   not so much.
 * MUCH APPRECIATED.
    -  This reply was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
    -  This reply was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
    -  This reply was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
    -  This reply was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
 *  [Mark](https://wordpress.org/support/users/markwolters/)
 * (@markwolters)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12098803)
 * You can fix it in the same way as the add action is fixed by calling the function
   of the object:
 * Do this:
 *     ```
       	add_settings_section(
       	   'links_setting_section',
       	   'Social Links',
       	   array($this, 'links_setting_section_callback_function'),
       	   'general'
       ```
   
 * Instead of this:
 *     ```
       	add_settings_section(
       	   'links_setting_section',
       	   'Social Links',
       	   'links_setting_section_callback_function',
       	   'general'
       ```
   
    -  This reply was modified 6 years, 5 months ago by [Mark](https://wordpress.org/support/users/markwolters/).
    -  This reply was modified 6 years, 5 months ago by [Mark](https://wordpress.org/support/users/markwolters/).
      Reason: typos
    -  This reply was modified 6 years, 5 months ago by [Mark](https://wordpress.org/support/users/markwolters/).
 *  Thread Starter [howster](https://wordpress.org/support/users/howster/)
 * (@howster)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12099531)
 * Outstanding. Thanks Mark. Exactly what I needed. I post the code that works for
   me.
 *     ```
       class myClass {
       	/**
       	 * Init function.
       	 *
       	 * @access public
       	 * @return void
       	 */
   
       	public function init()
           {
   
               add_action( 'admin_init', array( $this, 'page_init' ) );
           }
   
           public function page_init()
           {
   
       		register_setting( 'general', 'facebook_link' );
       		register_setting( 'general', 'twitter_link' );
       		register_setting( 'general', 'linkedin_link' );
       		register_setting( 'general', 'instagram_link' );
       		register_setting( 'general', 'youtube_link' );
   
               add_settings_section(
                   'setting_section_id', // ID
                   'Social Media Links', // Title
                   array( $this, 'print_section_info' ), // Callback
                   'general' // Page
               );
   
       		add_settings_field(
                   'facebook_link', // ID
                   'Facebook Link', // Title
                   array( $this, 'facebook_callback' ), // Callback
                   'general', // Page
                   'setting_section_id' // Section
       		);
       		   add_settings_field(
                   'twitter_link', // ID
                   'Twitter Link', // Title
                   array( $this, 'twitter_callback' ), // Callback
                   'general', // Page
                   'setting_section_id' // Section
       		);
   
       		add_settings_field(
                   'instagram_link', // ID
                   'Instagram Link', // Title
                   array( $this, 'instagram_callback' ), // Callback
                   'general', // Page
                   'setting_section_id' // Section
       		);
   
       		add_settings_field(
                   'linkedin_link', // ID
                   'LinkedIn Link', // Title
                   array( $this, 'linkedin_callback' ), // Callback
                   'general', // Page
                   'setting_section_id' // Section
       		);
   
       		add_settings_field(
                   'youtube_link', // ID
                   'YouTube Link', // Title
                   array( $this, 'youtube_callback' ), // Callback
                   'general', // Page
                   'setting_section_id' // Section
               );
   
           }
   
           /**
            * Print the Section text
            */
           public function print_section_info()
           {
               print 'Enter social media links below:';
           }
   
       		public function facebook_callback() {
       		$facebook_link = get_option( 'facebook_link', '' );
       		echo '<input id="facebook_link" style="width: 35%;" type="text" title="Facebook Link" name="facebook_link" value="' . sanitize_text_field($facebook_link) . '" />';
       		}
   
       		public function twitter_callback() {
       		$twitter_link = get_option( 'twitter_link', '' );
       		echo '<input id="twitter_link" style="width: 35%;" type="text" title="Twitter Link" name="twitter_link" value="' . sanitize_text_field($twitter_link) . '" />';
       		}
   
       		public function linkedin_callback() {
       		$linkedin_link = get_option( 'linkedin_link', '' );
       		echo '<input id="linkedin_link" style="width: 35%;" type="text" title="LinkedIn Link" name="linkedin_link" value="' . sanitize_text_field($linkedin_link) . '" />';
       		}
   
       		public function instagram_callback() {
       		$instagram_link = get_option( 'instagram_link', '' );
       		echo '<input id="instagram_link" style="width: 35%;" type="text" title="Instagram Link" name="instagram_link" value="' . sanitize_text_field($instagram_link) . '" />';
       		}
   
       		public function youtube_callback() {
       		$youtube_link = get_option( 'youtube_link', '' );
       		echo '<input id="youtube_link" style="width: 35%;" type="text" title="YouTube Link" name="youtube_link" value="' . sanitize_text_field($youtube_link) . '" />';
       		}
       }
       ```
   
    -  This reply was modified 6 years, 5 months ago by [howster](https://wordpress.org/support/users/howster/).
 *  Thread Starter [howster](https://wordpress.org/support/users/howster/)
 * (@howster)
 * [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12099542)
 * Example 2 here was also very useful: [https://codex.wordpress.org/Creating_Options_Pages](https://codex.wordpress.org/Creating_Options_Pages)

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Using OOP and admin_init in Settings>General’ is closed to new replies.

## Tags

 * [admin settings](https://wordpress.org/support/topic-tag/admin-settings/)
 * [admin_init](https://wordpress.org/support/topic-tag/admin_init/)
 * [oop](https://wordpress.org/support/topic-tag/oop/)

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 5 replies
 * 3 participants
 * Last reply from: [howster](https://wordpress.org/support/users/howster/)
 * Last activity: [6 years, 5 months ago](https://wordpress.org/support/topic/using-oop-and-admin_init-in-settingsgeneral/#post-12099542)
 * Status: not resolved

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