php-查找重复项并按数组属性排序[关闭]

Question

我有大量相关的产品。我想检查是否有 重复 产品然后以 低价 获得产品。

我可以使用 array_unique 和 array_count_values 来查找重复记录，但我不知道如何处理排序部分。

数组属性：

• product_id（唯一）
• 标题
• 价格

样本数据

大批 ( [0] => 数组 ( [product_id] => 1111 [标题] => 产品 1 [价格] => 140 ) [1] => 数组 ( [product_id] => 2222 [标题] => 产品 2 [价格] => 66 ) [2] => 数组 ( [product_id] => 1111 [标题] => 产品 1 A [价格] => 123 ) [3] => 数组 ( [product_id] => 3333 [标题] => 产品 3 [价格] => 37.4 ) [4] => 数组 ( [product_id] => 4444 [标题] => 产品 4 [价格] => 10.5 ) )

产品1是重复的，所以对产品1会有一个记录，并且应该保留低价。

输出应该是这样的

大批 ( [0] => 数组 ( [product_id] => 1111 [标题] => 产品 1 [价格] => 123 ) [1] => 数组 ( [product_id] => 2222 [标题] => 产品 2 [价格] => 66 ) [2] => 数组 ( [product_id] => 3333 [标题] => 产品 3 [价格] => 37.4 ) [3] => 数组 ( [product_id] => 4444 [标题] => 产品 4 [价格] => 10.5 ) )

Answer 1

这将创建一个仅包含唯一 product_id 的数组，其中仅显示每个 product_id 的最低价格：

$products_lowestprices = [];

foreach ( $products AS &$product ) {

  if ( isset( $products_lowestprices[ $product[ 'product_id' ] ] ) ) {
    if ( $products_lowestprices[ $product[ 'product_id' ] ][ 'price' ] > $product[ 'price' ] ) {
      $products_lowestprices[ $product[ 'product_id' ] ] = $product;
    }
  } else {
    $products_lowestprices[ $product[ 'product_id' ] ] = $product;
  }

}

$products_lowestprices = array_values( $products_lowestprices );