Streichpreisen in WooCommerce einen Hinweistext hinzufügen: Dieses Mini-Plugin fügt WooCommerce-Produkten mit Streichpreisen einen eigene Hinweistext hinzu, der zu Beginn des Plugin-Codes, innerhalb der Funktion wc_min_max_price_suffix__defaults(), angepasst werden kann. Das Plugin nutzt die filterbare WooCommerce-Option ›Zusatz zur Preisangabe‹…

wc-min-max-price-suffix.php

<?php
/**
 * Plugin Name:       WooCommerce|Min-Max Price Suffix
 * Description:       Append custom text to min-max prices in WooCommerce.
 * Version:           2015.12
 * Author:            Caspar Hübinger, Inpsyde
 * Author URI:        https://marketpress.com
 * License:           GNU General Public License v3 or later
 * License URI:       http://www.gnu.org/licenses/gpl-3.0.html
 */


if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * EDIT YOUR CUSTOM TEXT IN THIS FUNCTION.
 *
 * @return array Default text and link URL used later on
 */
function wc_min_max_price_suffix__defaults() {

	$defaults = array();

	/* Enter a page ID of page linked in custom text.
	 * Here: defined by WGM option.
	 */
	$defaults[ 'suffix-link-page-id' ] = absint( get_option( 'woocommerce_bestellvorgang_page_id' ) );

	// Retrieve URL from page ID.
	$defaults[ 'suffix-link-url' ] = get_permalink( $defaults[ 'suffix-link-page-id' ] );

	/* Enter custom text to be displayed after min-max prices.
	 * Optionally including a link to page specified above.
	 * Use %s as a placeholder within sprintf() for URL retrieved above .
	 */
	$defaults[ 'suffix-text' ]  = '* Eigener Text zu Streichpreisen hierhin.';
	$defaults[ 'suffix-text' ] .= sprintf( ' Ggf. auch mit <a href="%s" target="_blank">Link</a>.',
		esc_url( $defaults[ 'suffix-link-url' ] )
	);

	/* STOP EDITING HERE. */

	return $defaults;
}

/**
 * Load plugin.
 *
 * @return void
 */
function wc_min_max_price_suffix__plugins_loaded() {

	if ( ! class_exists( 'WC_Product' ) ) {
		return;
	}

	// Filter WooCommerce price suffix and min-max prices.
	add_filter( 'woocommerce_get_price_suffix', 'wc_min_max_price_suffix__render_price_suffix', 10, 2 );
	add_filter( 'woocommerce_get_price_html_from_to', 'wc_min_max_price_suffix__render_min_max_price', 10, 4 );
}
add_action( 'plugins_loaded', 'wc_min_max_price_suffix__plugins_loaded' );

/**
 * Render custom price suffix.
 *
 * @param  mixed  $price_display_suffix Option value, boolean or string
 * @param  object $product              Product object
 * @return mixed                        String or boolean option value
 */
function wc_min_max_price_suffix__render_price_suffix( $price_display_suffix, $product ) {

	// Stop here if this is admin, OR $product does not have min-max prices.
	if ( ! wc_min_max_price_suffix__is_min_max_price_shop( $product ) ) {
		return $price_display_suffix;
	}

	// Get plugin defaults.
	$defaults = wc_min_max_price_suffix__defaults();

	// Wrap text in HTML like WooCommerce does.
	// See https://github.com/woothemes/woocommerce/blob/2.4.10/includes/abstracts/abstract-wc-product.php#L916
	$price_display_suffix = sprintf(
		' <small class="woocommerce-price-suffix wgm-min-max-price-suffix clear">%s</small>',
		sanitize_post_field( 'post_content', $defaults[ 'suffix-text' ], 0, 'display' )
	);

	return $price_display_suffix;
}

/**
 * Append asterisk to min-max price.
 *
 * @param  string $price   Price HTML
 * @param  mixed  $from    String or float to wrap with 'from' text
 * @param  mixed  $to      String or float to wrap with 'to' text
 * @param  object $product Product object
 * @return string          Price HTML
 */
function wc_min_max_price_suffix__render_min_max_price( $price, $from, $to, $product ) {

	if ( wc_min_max_price_suffix__is_min_max_price( $product ) ) {
		$price .= '<span class="wgm-min-max-price-indicator">*</span>';
	}

	return $price;
}

/**
 * Helper: Make sure we’re in the front-end AND
 * WooCommerce product has a min-max price.
 *
 * @param  object  $product Product object
 * @uses                    wc_min_max_price_suffix__is_min_max_price()
 * @return bool             TRUE for products with a min-max price outside WP admin area
 */
function wc_min_max_price_suffix__is_min_max_price_shop( $product ) {

	return (bool) ! is_admin() && wc_min_max_price_suffix__is_min_max_price( $product );
}


/**
 * Helper: Check if WooCommerce product has a min-max price.
 *
 * @param  object  $product Product object
 * @return bool             TRUE for products with a min-max price
 */
function wc_min_max_price_suffix__is_min_max_price( $product ) {

	/* Returns TRUE if
	 * - $product is a simple product with a sale price
	 * -OR-
	 * - $product is a variable product AND prices of variations are not identical
	 */
	return (bool) $product->get_sale_price() || ( $product->min_variation_price && $product->min_variation_price !== $product->max_variation_price );
}