数据库字段中存储的数据数量乘以不同单价的和的算法示例

    数据库字段中存储的数据数量乘以不同单价的和的算法，适用于记账本程序的计件数据记录，和商品记录等场景。

    代码示例如下：

<?php

//模拟数据库结果集
$arr = array(
                      array( "id" => 1, "name" => "孙悟空", "nums" => 234, "unitPrice" =>1.2),
                      array( "id" => 2, "name" => "孙悟空", "nums" => 568, "unitPrice" =>1.3),
                      array( "id" => 3, "name" => "孙悟空", "nums" => 986, "unitPrice" =>1.8),
                      array( "id" => 4, "name" => "孙悟空", "nums" => 423, "unitPrice" =>1.1),
                      array( "id" => 5, "name" => "孙悟空", "nums" => 189, "unitPrice" =>1.0)
                          );

$val = [];
foreach( $arr as $value )
{
    $val[] = $value["nums"] * $value["unitPrice"];
}

$total = array_sum( $val );

echo '总共' . $arr[0]["name"] . '先生/女士的工资是：' . $total . '元';

    代码执行后的效果如下：