WooCoommerce Simple Product Tabs

GG_Woocommerce_Product_Tab.php

<?php

/**
 * GGWooCommerceProductTab class.
 *
 * Displays a new tab with an editor for every instance created and controls it saving.
 */
class GGWooCommerceProductTab
{		
    /**
     * Variables
     *
     * Store some variables to avoid name mixing.
     */
    private $name;
    private $field_name;
    private $anchor_id;
    private $priority;
    
    /**
     * __construct function.
     *
     * Constructor sets variables and hooks functions with markup and the saving handler.
     * 
     * @access public
     * @param mixed $args
     * @return void
     */
    public function __construct ( $args )
    {

            // Needs an array of args to instanciate.
            if ( !is_array( $args ) )
                return;
            
            // Set variables
            $this->name       = $args['name'];
            $this->field_name = $args['field_name'];
            $this->anchor_id  = $args['anchor_id'];
            $this->priority   = $args['priority'] ? $args['priority'] : 100;
            
            // Tab Title, content and saving handle.
            add_action( 'woocommerce_product_write_panel_tabs', array( $this, 'outputTabTitle'       ) );
            add_action( 'woocommerce_product_write_panels',     array( $this, 'outputTabEditContent' ) );
            add_action( 'woocommerce_process_product_meta',     array( $this, 'saveTab'              ) );
            
            // Display tabs in the front.
            add_filter( 'woocommerce_product_tabs', array( $this, 'productTab' ) );
    }
    
    /**
     * createTab function.
     * 
     * Holds your tab title (Remember to add your own icon ;) )
     *
     * @access private
     * @return void
     */
    public function outputTabTitle ()
    {
        ?>
        <!-- The ID of the <a> tag is the link to the content. -->
        <li class="custom_tab">
            <a href="#<?= $this->anchor_id ?>"><?= $this->name ?></a>
        </li>
        <?php
    }
	
    /**
     * outputTabEditContent function.
     * 
     * Outputs the tab content
     *
     * @access private
     * @return void
     */
    public function outputTabEditContent ()
    {
        global $woocommerce, $post;
        
        // This has to be the same ID as the <a> tag on the previous function
        echo '<div id="' . $this->anchor_id . '" class="panel woocommerce_options_panel">';
        
        // Just a div for grouping many fields
        echo '<div class="options_group">';
            
            // Get the current content of the field for giving it to the
            // wp_editor. (Remember the ID. For saving, updating, displaying...)
            $content = get_post_meta( $post->ID, $this->field_name, true );
            wp_editor( $content, $this->field_name );
			
        echo '</div>';
        // Closes .options_group
        
        echo '</div>';
        // Closes #custom_tab_data
    }
	
    /**
     * saveTab function.
     *
     * Saves the content of all the fields displayed on outputTabContent();
     * 
     * @access public
     * @return void
     */
    public function saveTab ( $post_id )
    {
        $editor_content = $_POST[$this->field_name];
        update_post_meta( $post_id, $this->field_name, $editor_content );
    }
    
    /**
     * productTab function.
     * 
     * Sets a new tab on the tabs array.
     *
     * @access public
     * @param mixed $tabs
     * @return void
     */
    public function productTab ( $tabs )
    {
        global $post;
        
        $content = get_post_meta( $post->ID, $this->field_name, true);
        
        // Check if we have content, so we hide tabs with no content.
        if ( $content ) :
            $tabs[$this->field_name] = array(
                'title'    => $this->name,
                'priority' => $this->priority,
                'callback' => array( $this, 'outputProductTabContent' )
            );
        endif;
        
        return $tabs;
    }
    
    /**
     * outputProductTabContent function.
     *
     * Outputs the content of the tab.
     * 
     * @access public
     * @return void
     */
    public function outputProductTabContent ()
    {
        global $post;
        echo do_shortcode( get_post_meta( $post->ID, $this->field_name, true) );
    }
}