php从数组中获取值时显示错误答案

【问题标题】：php showing error when getting the values from an arrayphp从数组中获取值时显示错误
【发布时间】：2012-11-24 07:55:38
【问题描述】：

在 php 中我的代码是这样的

  $discounts =  $this->model_catalog_product->getProductDiscounts($product_id);
      $product_discounts[] = array();
      foreach($discounts as $discount) {
        $product_discounts[] = array(
          'quantity' => $discount['quantity'],
          'price'    => $this->currency->format($this->tax->calculate($discount['price'], $product_info['tax_class_id'], $this->config->get('config_tax')))
        );
      }

现在当我让它显示我的数组时

Array ( [0] => Array ( [product_discount_id] => 483 [product_id] => 43 [customer_group_id] => 8 [quantity] => 2 [priority] => 1 [price] => 345.0000 [date_start] => 0000-00-00 [date_end] => 0000-00-00 ) [1] => Array ( [product_discount_id] => 484 [product_id] => 43 [customer_group_id] => 8 [quantity] => 4 [priority] => 2 [price] => 784.0000 [date_start] => 0000-00-00 [date_end] => 0000-00-00 ) [2] => Array ( [product_discount_id] => 485 [product_id] => 43 [customer_group_id] => 8 [quantity] => 5 [priority] => 3 [price] => 786.0000 [date_start] => 0000-00-00 [date_end] => 0000-00-00 ) )

但是当我编写代码以从数组中获取折扣数量和折扣价格的值时

 <?php foreach ($discounts as $discount) {
    echo sprintf($text_discount, $discount['quantity'], $discount['price']); ?>
    } ?>

我收到了这样的错误Undefined variable: discounts

【问题讨论】：

标签： php arrays arraylist

【解决方案1】：

替换这个

$product_discounts[] = array();

与

$product_discounts = array();

【讨论】：

这实际上不是错误，也没有回答问题。

【解决方案2】：

$discounts 从未被定义。应该是$product_discounts。这就是为什么你会收到undefined variable discounts。

<?php
foreach ($product_discounts as $discount) {
    echo sprintf($text_discount, $discount['quantity'], $discount['price']); ?>
}?>

【讨论】：

【解决方案3】：

试试这个

$discounts =  $this->model_catalog_product->getProductDiscounts($product_id);
  $product_discounts = array();
  foreach($discounts as $discount) {
    $product_discounts = array(
      'quantity' => $discount['quantity'],
      'price'    => $this->currency->format($this->tax->calculate($discount['price'], $product_info['tax_class_id'], $this->config->get('config_tax')))
    );
  }

【讨论】：