我正在尝试解决此代码的问题。我已经取得了进步，但我正在做一个简单的平均计算。当我尝试在使用变量之前声明它时，我遇到了问题。当我尝试使用它时，我收到错误消息，提示声明变量。知道我在 $Average 部分做错了什么吗？我要么无法渲染页面，要么得到 0.00，因为当我声明变量时，我还没有输入。<?php // get the data from the form $first = filter_input(INPUT_POST, 'first'); $last = filter_input(INPUT_POST, 'last'); $one = filter_input(INPUT_POST, 'one', FILTER_VALIDATE_FLOAT); $two = filter_input(INPUT_POST, 'two', FILTER_VALIDATE_FLOAT); $three = filter_input(INPUT_POST, 'three', FILTER_VALIDATE_FLOAT); //var = $Average ; $Sum = filter_input(INPUT_POST, 'Sum'); // validate Score one if ($one === FALSE ) { $error_message = 'Score one must be a valid number.'; } else if ( $one < 0 ) { $error_message = 'Score one cannot be less than zero.'; // validate Score two if ($two === FALSE ) { $error_message = 'Score two must be a valid number.'; } else if ( $two < 0 ) { $error_message = 'Score two cannot be less than zero.'; // validate Score three if ($three === FALSE ) { $error_message = 'Score three must be a valid number.'; } else if ( $three < 0 ) { $error_message = 'Score three cannot be less than zero.'; // set error message to empty string if no invalid entries } else { $error_message = ''; } // if an error message exists, go to the index page if ($error_message != '') { include('index.php'); exit(); } // calculate the average score //$Sum = $one; + $two; + $three; //$Average = $Sum / 3;}} $Average = ($one + $two + $three)/3;}} $Average = number_format($Average, 2); ?><!DOCTYPE html><html><head> <title>Assignment 2</title> <link rel="stylesheet" type="text/css" href="main.css"/></head><body>
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UYOU
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在您的 if else 代码中，您的值无法到达计算行。我编辑了这部分并包含 $one 、 $two 、 $ Three 的 isset ：
<?php
// get the data from the form
$first = filter_input(INPUT_POST, 'first');
$last = filter_input(INPUT_POST, 'last');
$one = filter_input(INPUT_POST, 'one',
FILTER_VALIDATE_FLOAT);
$two = filter_input(INPUT_POST, 'two',
FILTER_VALIDATE_FLOAT);
$three = filter_input(INPUT_POST, 'three',
FILTER_VALIDATE_FLOAT);
//var = $Average ;
$Sum = filter_input(INPUT_POST, 'Sum');
if(!isset($one)){$one=0;}else{$error_message ='You must enter a value';}
if(!isset($two)){$two=0;}else{$error_message ='You must enter a value';}
if(!isset($three)){$three=0;}else{$error_message ='You must enter a value';}
// validate Score one
if ($one === FALSE ) {
$error_message = 'Score one must be a valid number.';
} else if ( $one < 0 ) {
$error_message = 'Score one cannot be less than zero.';
// validate Score two}
}
if ($two === FALSE ) {
$error_message = 'Score two must be a valid number.';
} else if ( $two < 0 ) {
$error_message = 'Score two cannot be less than zero.';
// validate Score three
}
if ($three === FALSE ) {
$error_message = 'Score three must be a valid number.';
} else if ( $three < 0 ) {
$error_message = 'Score three cannot be less than zero.';
// set error message to empty string if no invalid entries
} else {
$error_message = ''; }
// if an error message exists, go to the index page
if ($error_message != '') {
include('index.php');
exit();
}
// calculate the average score
//$Sum = $one; + $two; + $three;
//$Average = $Sum / 3;}}
$Average = ($one + $two + $three)/3;
$Average = number_format($Average, 2);
?>
<!DOCTYPE html>
<html>
<head>
<title>Assignment 2</title>
<link rel="stylesheet" type="text/css" href="main.css"/>
</head>
<body>
<main>
<h1>Assignment 2</h1>
<label>Student Name:</label>
<span><?php echo $first; ?></span><span><?php echo " ", $last; ?></span><br />
<label>Your Scores:</label>
<span><?php echo $one, ","; ?></span> <span><?php echo $two, ","; ?></span> <span><?php echo $three; ?></span><br />
<label>Average:</label>
<span><?php echo $Average; ?></span><br />
</main>
</body>
</html>
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