I’m taking php/SQL course and for the life of me I can’t figure out why I’m getting “Undefined variable” errors when I run the code. All errors are on the loop_tester.php files - lines 32, 35, 38, 60 and 63. There are 2 files index.php and loop_tester.php.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Loop Tester</title>
<link rel="stylesheet" type="text/css" href="main.css"/>
</head>
<body>
<div id="content">
<h1>Loop Tester</h1>
<h2>Process Scores</h2>
<form action="." method="post">
<input type="hidden" name="action" value="process_scores" />
<label>Score 1:</label>
<input type="text" name="scores[]"
value="<?php echo $scores[0]; ?>"/><br />
<label>Score 2:</label>
<input type="text" name="scores[]"
value="<?php echo $scores[1]; ?>"/><br />
<label>Score 3:</label>
<input type="text" name="scores[]"
value="<?php echo $scores[2]; ?>"/><br />
<label> </label>
<input type="submit" value="Process Scores" /><br />
<label>Scores:</label>
<span><?php echo $scores_string; ?></span><br />
<label>Score Total:</label>
<span><?php echo $score_total; ?></span><br />
<label>Average Score:</label>
<span><?php echo $score_average; ?></span><br />
</form>
<br />
<h2>Process 1000 Die Rolls</h2>
<form action="." method="post">
<input type="hidden" name="action" value="process_rolls" />
<label>Number to Roll:</label>
<select name="number_to_roll">
<?php // for loop to display option
for ($i = 1; $i < 7; $i++) : ?>
<option value="<?php echo $i; ?>"><?php echo $i; ?></option>
<?php endfor; ?>
</select><br />
<label> </label>
<input type="submit" value="Process Rolls" /><br />
<label>Maximum Rolls:</label>
<span><?php echo $max_rolls; ?></span><br />
<label>Average Rolls:</label>
<span><?php echo $average_rolls; ?></span><br />
</form>
</div>
</body>
</html>[php]<?php
if (isset($_POST[‘action’])) {
$action = $_POST[‘action’];
} else {
$action = ‘start_app’;
}
switch ($action) {
case ‘start_app’:
$scores = array();
$scores[0] = 70;
$scores[1] = 80;
$scores[2] = 90;
break;
case 'process_scores':
$scores = $_POST['scores'];
// Q6 - for loop to validate user entries
$is_valid = true;
for ($i = 0; $i < count($scores); $i++) {
if (empty($scores[$i]) || !is_numeric($scores[$i])) {
$scores_string = 'You must enter three valid numbers.';
$is_valid = false;
break;
}
}
if (!$is_valid) {
break;
}
// Q5 - calculate total and average
$scores_string = '';
$score_total = 0;
foreach ($scores as $s) {
$scores_string .= $s . '|';
$score_total += $s;
}
$scores_string = substr($scores_string, 0, strlen($scores_string)-1);
// calculate the average
$score_average = $score_total / count($scores);
// format the total and average
$score_total = number_format($score_total, 2);
$score_average = number_format($score_average, 2);
break;
case ‘process_rolls’:
$number_to_roll = $_POST[‘number_to_roll’];
$total = 0;
$max_rolls = -INF;
// Q8 - for loop to process rolls
for ($count = 0; $count <10000; $count++) {
$rolls = 1;
while (mt_rand(1, 6) !=$number_to_roll) {
$rolls++;
}
$total += $rolls;
$max_rolls = max($rolls, $max_rolls);
}
$average_rolls = $total / $count;
break;
}
include ‘loop_tester.php’;
?>[/php]