Add WooCommerce custom fields to a product

function cfwc_create_custom_field() {
 $args = array(
 'id' => 'custom_text_field_title',
 'label' => __( 'Levertijd info', 'cfwc' ),
 'class' => 'cfwc-custom-field',
 'desc_tip' => true,
 'description' => __( 'Levertijd info.', 'ctwc' ),
 );
 woocommerce_wp_text_input( $args );
}
add_action( 'woocommerce_product_options_general_product_data', 'cfwc_create_custom_field' );
function cfwc_save_custom_field( $post_id ) {
 $product = wc_get_product( $post_id );
 $title = isset( $_POST['custom_text_field_title'] ) ? $_POST['custom_text_field_title'] : '';
 $product->update_meta_data( 'custom_text_field_title', sanitize_text_field( $title ) );
 $product->save();
}
add_action( 'woocommerce_process_product_meta', 'cfwc_save_custom_field' );
function cfwc_display_custom_field() {
 global $post;
 // Check for the custom field value
 $product = wc_get_product( $post->ID );
 $title = $product->get_meta( 'custom_text_field_title' );
 if( $title ) {
 // Only display our field if we've got a value for the field title
 printf(
 '<div class="cfwc-custom-field-wrapper"><label for="cfwc-title-field">%s</label></div>',
 esc_html( $title )
 );
 }
}
add_action( 'woocommerce_before_add_to_cart_button', 'cfwc_display_custom_field' );

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