我在MVC程序中调用函数时遇到错误。
Notice: Undefined variable: calculate in D:\xampp\htdocs\ch07en\future_value_calculator\index.php on line 26
Notice: Undefined variable: calculate in D:\xampp\htdocs\ch07en\future_value_calculator\index.php on line 27
我知道这个功能在我的模型中有效，其他一切都很完美。当我拨打calculate_investment($calculate);时，我会收到通知，但是当我不打电话时，该程序无法计算用户放入字段的所有内容。我究竟做错了什么？我在哪里需要定义变量？
以下是我的文件：
<?php
include('../model/calculator.php');
$action = filter_input(INPUT_POST, 'action');
if ($action == NULL) {
$action = filter_input(INPUT_GET, 'action');
if ($action == NULL) {
$action = 'future_value_calculator';
}
}
//Display future value calculator
if ($action == 'future_value_calculator') {
$investment = filter_input(INPUT_POST, 'investment', FILTER_VALIDATE_FLOAT);
$years = filter_input(INPUT_POST, 'years', FILTER_VALIDATE_INT);
include('mainCalculator.php');
//When user presses calculate, calculate the FV
} else if ($action == 'calculate') {
$investment_f = filter_input(INPUT_POST, 'investment', FILTER_VALIDATE_FLOAT);
$interest_rate = filter_input(INPUT_POST, 'interest_rate', FILTER_VALIDATE_FLOAT);
$years = filter_input(INPUT_POST, 'years', FILTER_VALIDATE_INT);
$future_value_f = filter_input(INPUT_POST, 'future_value_f', FILTER_VALIDATE_INT);
if ($years == NULL) {
$error = 'Enter a number in the years field and try again.';
include('../errors/error.php');
} else {
$calculate = calculate_investment($calculate);
if ($calculate) {
include('displayResults.php');
}
}
}
?>
<!DOCTYPE html>
<html>
<body>
<main>
<h1>Future Value Calculator</h1>
<label>Investment Amount:</label>
<span><?php echo $investment_f; ?></span><br>
<label>Yearly Interest Rate:</label>
<span><?php echo $interest_rate_f; ?></span><br>
<label>Number of Years:</label>
<span><?php echo $years; ?></span><br>
<label>Future Value:</label>
<span><?php echo $future_value_f; ?></span><br>
<label>Compound Interest Box Checked?</label>
<span><?php echo $future_value_f; ?></span><br>
<label>Compound Monthly:</label>
<span><?php echo $future_value_f; ?></span><br>
</main>
</body>
</html>
<?php
function calculate_investment($calculate){
// get the data from the form
$investment = filter_input(INPUT_POST, 'investment', FILTER_VALIDATE_FLOAT);
$interest_rate = filter_input(INPUT_POST, 'interest_rate', FILTER_VALIDATE_FLOAT);
$investment_f = filter_input(INPUT_POST, 'interest_f', FILTER_VALIDATE_FLOAT);
$yearly_rate_f = filter_input(INPUT_POST, 'yearly_rate_f ', FILTER_VALIDATE_INT);
$years = filter_input(INPUT_POST, 'years', FILTER_VALIDATE_INT);
$future_value_f = filter_input(INPUT_POST, 'future_value_f', FILTER_VALIDATE_INT);
$interest = filter_input(INPUT_POST, 'interest', FILTER_VALIDATE_INT);
// calculate the future value
$future_value = $investment;
for ($i = 1; $i <= $years; $i++) {
$future_value = ($future_value + ($future_value * $interest_rate *.01));
}
// apply currency and percent formatting
$investment_f = '$'.number_format($investment, 2);
$yearly_rate_f = $interest_rate.'%';
$future_value_f = '$'.number_format($future_value, 2);
}
?>
答案 0 :(得分：0)
您需要从函数calculate_investment返回一些值。
例如：
<?php
function calculate_investment($calculate){
// get the data from the form
$investment = filter_input(INPUT_POST, 'investment', FILTER_VALIDATE_FLOAT);
$interest_rate = filter_input(INPUT_POST, 'interest_rate', FILTER_VALIDATE_FLOAT);
$investment_f = filter_input(INPUT_POST, 'interest_f', FILTER_VALIDATE_FLOAT);
$yearly_rate_f = filter_input(INPUT_POST, 'yearly_rate_f ', FILTER_VALIDATE_INT);
$years = filter_input(INPUT_POST, 'years', FILTER_VALIDATE_INT);
$future_value_f = filter_input(INPUT_POST, 'future_value_f', FILTER_VALIDATE_INT);
$interest = filter_input(INPUT_POST, 'interest', FILTER_VALIDATE_INT);
// calculate the future value
$future_value = $investment;
for ($i = 1; $i <= $years; $i++) {
$future_value = ($future_value + ($future_value * $interest_rate *.01));
}
// apply currency and percent formatting
$investment_f = '$'.number_format($investment, 2);
$yearly_rate_f = $interest_rate.'%';
$future_value_f = '$'.number_format($future_value, 2);
return $future_value_f;
}
?>