基本的PHP表格計算問題

我正在做的事情可能非常愚蠢，想知道如果我能讓任何人指出我做錯了什麼。教我自己的PHP，並在這樣做，我試圖做一個工資計算器。它給了我這些結果：基本的PHP表格計算問題

Your results: 
29 years old earning 
$205per day working 
$5days a week at a 
Your total earned money at age 65 is $0. 
While your yearly income is 
49200

雖然很明顯總賺錢的數字是不正確的。 0是不正確的。

下面是完整的代碼

<?php 

//get the values from the $_POST array 

$age = $_POST['age']; 
$days = $_POST['days']; 
$pay = $_POST['pay']; 



//calculate the total: 

$howold = 65 - $age; 
$retireageincome = $yearlyincome * $howold; 
$yearlyincome = $pay * $days * 4 * 12; 




//print out results 

print "<p>Your results:<br> 
<span class=\"number\">$age</span> years old earning <br> 
$<span class=\"number\">$pay</span>per day working <br> 
$<span class=\"number\">$days</span>days a week at a<br> 
Your total earned money at age 65 is $<span class=\"number  
\">$retireageincome</span>.<br> 
While your yearly income is <br> 
<span class=\"number\">$yearlyincome</span> </p>"; 

?> 

</body> 
</html>

來源

2017-07-19 daytradeit

仔細查看你的代碼和/或打開錯誤報告，你會看到你的問題。 – WheatBeak

$ retireageincome在$ annualincome後得到計算...我認爲您的訂單已關閉... – VA79

謝謝。我其實甚至沒有意識到變量的順序。 – daytradeit

您正在嘗試是已知的$yearlyincome值之前使用$yearlyincome。

命令的順序很重要。移動

$yearlyincome = $pay * $days * 4 * 12;

在使用$yearlyincome是前行，你會看到一個非0值。

來源

2017-07-19 18:02:27 Dennis

基本的PHP表格計算問題

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