manuelhudec/woocommerce-product-subtitle.php

## woocommerce-product-subtitle.php
//Register the product custom field
add_action( 'woocommerce_product_options_inventory_product_data', 'my_woocommerce_product_subheading' );

function my_woocommerce_product_subheading() {
    $args = array(
        'label' => 'Produkt-Untertitel', // Text in Label
        'placeholder' => 'Produkt-Untertitel',
        'id' => 'product_subheading', // required
        'name' => 'product_subheading',
        'desc_tip' => 'Produkt-Untertitel eingeben',
    );
    woocommerce_wp_text_input( $args );
}

//Save the custom field as product custom post meta
add_action( 'woocommerce_process_product_meta', 'my_woocommerce_save_product_subheading' );

function my_woocommerce_save_product_subheading( $post_id ) {
    $product = wc_get_product( $post_id );
    $title = isset( $_POST['product_subheading'] ) ? $_POST['product_subheading'] : '';
    $product->update_meta_data( 'product_subheading', sanitize_text_field( $title ) );
    $product->save();
}

//Display the custom field on product page loop below the title
add_action( 'blocksy:woocommerce:product-single:price:before', 'subheading_display_below_title', 2 );
function subheading_display_below_title(){
    global $product;

    // Get the custom field value
    $subheading = get_post_meta( $product->get_id(), 'product_subheading', true );

    // Display
    if( ! empty($subheading) ){
        echo '<div class="subheading">'.$subheading.'</div>';
    }
}

remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 10 );
add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 11 );
	//Register the product custom field
	add_action( 'woocommerce_product_options_inventory_product_data', 'my_woocommerce_product_subheading' );

	function my_woocommerce_product_subheading() {
	$args = array(
	'label' => 'Produkt-Untertitel', // Text in Label
	'placeholder' => 'Produkt-Untertitel',
	'id' => 'product_subheading', // required
	'name' => 'product_subheading',
	'desc_tip' => 'Produkt-Untertitel eingeben',
	);
	woocommerce_wp_text_input( $args );
	}

	//Save the custom field as product custom post meta
	add_action( 'woocommerce_process_product_meta', 'my_woocommerce_save_product_subheading' );

	function my_woocommerce_save_product_subheading( $post_id ) {
	$product = wc_get_product( $post_id );
	$title = isset( $_POST['product_subheading'] ) ? $_POST['product_subheading'] : '';
	$product->update_meta_data( 'product_subheading', sanitize_text_field( $title ) );
	$product->save();
	}

	//Display the custom field on product page loop below the title
	add_action( 'blocksy:woocommerce:product-single:price:before', 'subheading_display_below_title', 2 );
	function subheading_display_below_title(){
	global $product;

	// Get the custom field value
	$subheading = get_post_meta( $product->get_id(), 'product_subheading', true );

	// Display
	if( ! empty($subheading) ){
	echo '<div class="subheading">'.$subheading.'</div>';
	}
	}

	remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 10 );
	add_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 11 );