问题与foreach和循环语句在php

Question

我有一个$competitors（这是从MySQL检索的对象数组）（例如9），我有$competitors[i]->minSingleCarefee数据，即费用数据。我想对这些费用数据进行平均处理，但可能数据集并不完整，即我没有9个竞争对手的费用数据。因此，如果费用数据可用，我通过使用if语句并且递增$data_available来跟踪该数据。

我的问题是，它似乎代码有缺陷，因为它只返回第一个竞争对手的费用价值......我不知道为什么！同时$ data_available在我回显时总是最终为0。

//declaring variables 
$mm_avg_fees = 0; 
$data_available = 0; 

//function to calculate average fees 
function avg_fees($competitors, $mm_avg_fees, $data_available){ 

     foreach ($competitors as $competitor) { 
      //impose condition to increment data_available 
      //only if there is data in the minSingleCareFee column for the $competitor 
      if ($competitor->minSingleCareFee != NULL) { 
       $mm_avg_fees = $mm_avg_fees + $competitor->minSingleCareFee; 
       $data_available = $data_available + 1; 
      } else {} 
     } 
    return $mm_avg_fees/$data_available; 
} 

echo echo 'The current average for single room fees in your micromarket is: ' . avg_fees($competitors, $mm_avg_fees, $data_available); 

Answer 1

使用此：

//declaring variables 
$mm_avg_fees = 0; 
$data_available = 0; 

//function to calculate average fees 
function avg_fees($competitors, $mm_avg_fees, $data_available){ 

     foreach ($competitors as $competitor) { 
      //impose condition to increment data_available 
      //only if there is data in the minSingleCareFee column for the $competitor 
      if (!empty($competitor->minSingleCareFee)) { 
       $mm_avg_fees = $mm_avg_fees + $competitor->minSingleCareFee; 
       $data_available = $data_available + 1; 
      } 
     } 
    return $mm_avg_fees/$data_available; 
} 

echo 'The current average for single room fees in your micromarket is: ' . avg_fees($competitors, $mm_avg_fees, $data_available); 

Answer 2

1. 它是一个类里面呢？如果是这样，你不能这样做。
2. 其他{}是不必要的。
3. 你可以做$ data_available ++代替那里的东西。

4. 您正在将var作为对象。它是什么，一个变种或一个物体？

   $ competitor-> minSingleCareFee

，你设定的一些竞争对手是竞争对手阵中那一刻的价值。