WooCommerce - Create new Admin Product Data Tab

functions.php

<?php

/* CREATE THE NEW CUSTOM TAB
---------------------------------------------------- */
// First Register the Tab by hooking into the 'woocommerce_product_data_tabs' filter
add_filter( 'woocommerce_product_data_tabs', 'add_my_custom_product_data_tab' );
function add_my_custom_product_data_tab( $product_data_tabs ) {
    $product_data_tabs['my-custom-tab'] = array(
        'label' => __( 'My Custom Tab', 'woocommerce' ),
        'target' => 'my_custom_product_data',
        'class' => array( 'show_if_simple' ),
    );
    return $product_data_tabs;
}

/** CSS To Add Custom tab Icon */
function wcpp_custom_style() {
?>
<style>
#woocommerce-product-data ul.wc-tabs li.my-custom-tab_options a:before { font-family: WooCommerce; content: '\e006'; }
</style>
<?php 
}
add_action( 'admin_head', 'wcpp_custom_style' );





/* ADD FIELDS TO THE NEW CUSTOM TAB
---------------------------------------------------- */
// functions you can call to output text boxes, select boxes, etc.
add_action('woocommerce_product_data_panels', 'woocom_custom_product_data_fields');

function woocom_custom_product_data_fields() {
    global $post;

    // Note the 'id' attribute needs to match the 'target' parameter set above
    ?> 
    <div id='my_custom_product_data' class='panel woocommerce_options_panel'>
        <div class = 'options_group' >
            <?php
				// Text Field
				woocommerce_wp_text_input(
					array(
						'id' => '_text_field',
						'label' => __( 'Custom Text Field', 'woocommerce' ),
						'wrapper_class' => 'show_if_simple', //show_if_simple or show_if_variable
						'placeholder' => 'Custom text field',
						'desc_tip' => 'true',
						'description' => __( 'Enter the custom value here.', 'woocommerce' )
					)
				);

				// Number Field
				woocommerce_wp_text_input(
					array(
						'id' => '_number_field',
						'label' => __( 'Custom Number Field', 'woocommerce' ),
						'placeholder' => '',
						'description' => __( 'Enter the custom value here.', 'woocommerce' ),
						'type' => 'number',
						'custom_attributes' => array(
							'step' => 'any',
							'min' => '15'
						)
					)
				);

				// Checkbox
				woocommerce_wp_checkbox(
					array(
						'id' => '_checkbox',
						'label' => __('Custom Checkbox Field', 'woocommerce' ),
						'description' => __( 'Check me!', 'woocommerce' )
					)
				);

				// Select
				woocommerce_wp_select(
					array(
						'id' => '_select',
						'label' => __( 'Custom Select Field', 'woocommerce' ),
						'options' => array(
							'one' => __( 'Custom Option 1', 'woocommerce' ),
							'two' => __( 'Custom Option 2', 'woocommerce' ),
							'three' => __( 'Custom Option 3', 'woocommerce' )
						)
					)
				);

				// Textarea
				woocommerce_wp_textarea_input(
					array(
						'id' => '_textarea',
						'label' => __( 'Custom Textarea', 'woocommerce' ),
						'placeholder' => '',
						'description' => __( 'Enter the value here.', 'woocommerce' )
					)
				);
				?>
        </div>
    </div>
<?php
}

/** Hook callback function to save custom fields information */
function woocom_save_proddata_custom_fields($post_id) {
    // Save Text Field
    $text_field = $_POST['_text_field'];
    if (!empty($text_field)) {
        update_post_meta($post_id, '_text_field', esc_attr($text_field));
    }

    // Save Number Field
    $number_field = $_POST['_number_field'];
    if (!empty($number_field)) {
        update_post_meta($post_id, '_number_field', esc_attr($number_field));
    }
    // Save Textarea
    $textarea = $_POST['_textarea'];
    if (!empty($textarea)) {
        update_post_meta($post_id, '_textarea', esc_html($textarea));
    }

    // Save Select
    $select = $_POST['_select'];
    if (!empty($select)) {
        update_post_meta($post_id, '_select', esc_attr($select));
    }

    // Save Checkbox
    $checkbox = isset($_POST['_checkbox']) ? 'yes' : 'no';
    update_post_meta($post_id, '_checkbox', $checkbox);

    // Save Hidden field
    $hidden = $_POST['_hidden_field'];
    if (!empty($hidden)) {
        update_post_meta($post_id, '_hidden_field', esc_attr($hidden));
    }
}

add_action( 'woocommerce_process_product_meta_simple', 'woocom_save_proddata_custom_fields'  );

// You can uncomment the following line if you wish to use those fields for "Variable Product Type"
//add_action( 'woocommerce_process_product_meta_variable', 'woocom_save_proddata_custom_fields'  );





/* REPOSITION THE TAB
---------------------------------------------------- */
function woocom_custom_product_data_tab( $original_prodata_tabs) {
    $new_custom_tab['my-custom-tab'] = array(
        'label' => __( 'My Custom Tab', 'woocommerce' ),
        'target' => 'my_custom_product_data_tab',
        'class'     => array( 'show_if_simple', 'show_if_variable'  ),
    );
    $insert_at_position = 2; // Change this for desire position
    $tabs = array_slice( $original_prodata_tabs, 0, $insert_at_position, true ); // First part of original tabs
    $tabs = array_merge( $tabs, $new_custom_tab ); // Add new
    $tabs = array_merge( $tabs, array_slice( $original_prodata_tabs, $insert_at_position, null, true ) ); // Glue the second part of original
    return $tabs;
}