問題與foreach和循環語句在php

Question

我有一個$competitors（這是從MySQL檢索的對象數組）（例如9），我有$competitors[i]->minSingleCarefee數據，即費用數據。我想對這些費用數據進行平均處理，但可能數據集並不完整，即我沒有9個競爭對手的費用數據。因此，如果費用數據可用，我通過使用if語句並且遞增$data_available來跟蹤該數據。

我的問題是，它似乎代碼有缺陷，因爲它只返回第一個競爭對手的費用價值......我不知道爲什麼！同時$ data_available在我回顯時總是最終爲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. 它是一個類裏面呢？如果是這樣，你不能這樣做。
2. 其他{}是不必要的。
3. 你可以做$ data_available ++代替那裏的東西。

4. 您正在將var作爲對象。它是什麼，一個變種或一個物體？

   $ competitor-> minSingleCareFee

，你設定的一些競爭對手是競爭對手陣中那一刻的價值。