某些行不計入 foreach 循環

Question

我從包含 9xx 個項目的數據庫中獲取價格。 我在顯示項目頁面上添加了這個。 使用 Foreach $rows=$row。 vprice 是我的銷售價格，dprice 是我的經銷商價格

$commisionrate = 30;
$commisionfee  = 100;
$fee  = $row['dprice'] + $commisionfee;//+100
$x = $row['dprice'];
$y = $x * $commisionrate / 100;
$z = $x + $y;
$rate = $z;//(100*30%)+100
if (($rate > $row['vprice']) && ($fee < $row['vprice'])){
    echo $fee;
}elseif (($fee > $row['vprice']) && ($rate < $row['vprice'])){
    echo $rate;
}elseif ($row['dprice']=$row['vprice']){
    echo $row['dprice'];
}

當我重新檢查所有內容時，我發現$row['dprice']沒有被計算在內，仍然按舊價格顯示。 錯誤示例：我發現 vprice 為 188，計算后 dprice 為 80 dprice 應為 104，但不會改變，仍然保持在 80。

Answer 1

$commisionrate = 30;
$commisionfee  = 100;
$fee  = $row['dprice'] + $commisionfee;//+100
$x = $row['dprice'];
$y = $x * $commisionrate / 100;
$rate = $x + $y;

// You don't need to put nested brackets, it very simple condition    
if ($rate > $row['vprice'] && $fee < $row['vprice']){
    echo "fee: " . $fee; //add some hint words, so you know which condition fires

// You don't need to put nested brackets, it very simple condition
} elseif ($fee > $row['vprice'] && $rate < $row['vprice']) {
    echo "rate: " . echo $rate;

// USE double `==`, because when single `=` used, the condition always returns true and you're confused by your result
} elseif ($row['dprice'] == $row['vprice']) { 
    echo "row[\'dprice\']: " . $row['dprice'];

// add last else
} else {
   // this is helpful for debugging of your possible output, regardless you are awaiting some output here
}