HTML 表單 (Lab03_Task1.html)
<form method="post" action="Lab03_Task1_v4.php">
  <p>
    <label for="name">Name : </label>
    <input type="text" name="myname" id="myname">
  </p>
  <p>
    <label for="gYear">Graduate Year : </label>
    <input type="number" name="gYear" id="gYear">
  </p>
  <p>Almuni<br>
    <label><input type="radio" name="isAlumni" value="true"> Yes</label><br>
    <label><input type="radio" name="isAlumni" value="false"> No</label><br>
  <p>
    <label for="comments">Comments</label>
    <textarea name="comments" cols="60" rows="3" id="comments"></textarea>
  </p>
  <p><input type="submit" value="Submit"></p>
</form>

PHP 處理腳本 (Lab03_Task1_v4.php)
此版本使用了關聯式陣列 (Associative Array) 與 foreach 迴圈進行進階的動態驗證：

<?php
// 建立關聯式陣列儲存欄位資訊 (欄位型態, 顯示標籤)
$fields = array(
  'myname' => array('text', 'Name'),
  'gYear' => array('text', 'Graduate Year'),
  'isAlumni' => array('radio', 'Alumni'),
  'comments' => array('text', 'Comments')
);

$dataOK = true;
$dataMsg = "";
$errMsg = "";

foreach ($fields as $fieldname => $array) {
  $fieldtype = $array[0];
  $label = $array[1];
  switch ($fieldtype) {
    case 'text':
      if (strlen($_POST[$fieldname]) > 0)
        $dataMsg .= "$label = {$_POST[$fieldname]}<br>";
      else {
        $errMsg .= "$label field is empty !<br>";
        $dataOK = false;
      }
      break;
    case 'radio':
      if (isset($_POST[$fieldname]))
        $dataMsg .= "$label = {$_POST[$fieldname]}<br>";
      else {
        $errMsg .= "$label option is not selected !<br>";
        $dataOK = false;
      }
      break;
  }
}

if ($dataOK) {
  echo "<h2>All input data in the form are :</h2>";
  echo $dataMsg;
} else {
  echo "<h2 style='color:red'>Error Message :</h2>";
  echo $errMsg;
}
?>

HTML 表單 (Lab03_Task2.html)
<form method="post" action="Lab03_Task2.php">
  <p>
    <label for="num1">Enter first Number:</label>
    <input type="text" name="num1" id="num1">
  </p>
  <p>
    <label for="num2">Enter second Number:</label>
    <input type="text" name="num2" id="num2">
  </p>
  <p><input type="submit" value="Calculate"></p>
</form>
PHP 處理腳本 (Lab03_Task2.php)
<?php
  // 定義自定義函式
  function calTwoNumbers($n1, $n2) {
    return $n1 + $n2;
  }
?>

<h3>Calculate Two Numbers Function</h3>

<?php
  // 呼叫函式並帶入 POST 參數
  $total = calTwoNumbers($_POST['num1'], $_POST['num2']);
  
  echo "<p>The total of two numbers {$_POST['num1']} and {$_POST['num2']} is $total.</p>";
?>

PHP 處理腳本 (Lab03_Task3.php)
<?php
  extract($_POST); // 將 $_POST 中的 key 轉換為對應的變數
  $errorMsg = "";
  $dataOK = true;
  
  // 驗證輸入欄位
  if (strlen(trim($lname)) == 0) {
    $errorMsg .= "last name is invalid! ";
    $dataOK = false;
  }
  if (strlen(trim($fname)) == 0) {
    $errorMsg .= "first name is invalid! ";
    $dataOK = false;
  }
  if (strlen(trim($birthyear)) == 0) {
    $errorMsg .= "birth year is invalid! ";
    $dataOK = false;
  }

  // 計算年齡
  $age = date('Y') - $birthyear;

  if (!$dataOK) {
    // 輸入無效時的訊息
    echo "<h3>Hello, $errorMsg</h3>";
    echo "<p>Please re-enter the information</p>";
    echo '<p><a href="Lab03_Task3.html">Go back to form</a></p>';
  } else {
    // 年齡條件判斷
    if ($age >= 18) {
      echo "<h3>Welcome! $fname $lname</h3>";
      echo "<h3>You are now $age years old.</h3>";
    } else {
      echo "<h3 style='color:red'>Sorry $fname $lname, you are under 18!</h3>";
    }
  }
?>

<?php
  require_once('Connections/conn.php');
  $rs = mysqli_query($conn, $sql);
  $rc = mysqli_fetch_assoc($rs);
?>
<table border="1">
  <tr><th>Cust ID</th><th>Cust Name</th><th>Cust Password</th><th>Cust Gender</th></tr>
<?php
  do {
?>
  <tr>
    <td><?php echo $rc['custID']; ?></td>
    <td><?php echo $rc['custName']; ?></td>
    <td><?php echo $rc['custPswd']; ?></td>
    <td><?php echo $rc['custGender']; ?></td>
  </tr>
<?php
  } while ($rc = mysqli_fetch_assoc($rs));

  mysqli_free_result($rs);
  mysqli_close($conn);
?>
</table>

<?php
  require_once('Connections/conn.php');
  $sql = "SELECT * FROM customers";
  $rs = mysqli_query($conn, $sql);
  $rc = mysqli_fetch_assoc($rs);
?>
<table border="1">
  <tr><th>Cust ID</th><th>Cust Name</th><th>Cust Password</th><th>Cust Gender</th></tr>
<?php
  $i = 0;
  do {
    $i++;
?>
  <tr>
    <td><?php echo $rc['custID']; ?></td>
    <td><input type="text" value="<?php echo $rc['custName']; ?>" /></td>
    <td><input type="text" value="<?php echo $rc['custPswd']; ?>" /></td>
    <td>
      <label><input type="radio" name="rbGender<?php echo $i; ?>" <?php if($rc['custGender'] == "M") echo 'checked="checked"'; ?> />Male</label>
      <label><input type="radio" name="rbGender<?php echo $i; ?>" <?php if($rc['custGender'] == "F") echo 'checked="checked"'; ?> />Female</label>
    </td>
  </tr>
<?php
  } while ($rc = mysqli_fetch_assoc($rs));
  mysqli_free_result($rs);
  mysqli_close($conn);
?>
</table>

<?php
  if(isset($_POST['tfID'])) {
    require_once("Connections/conn.php");
    $sql = "SELECT * FROM Customers WHERE custID = '" . $_POST['tfID'] . "'";
    $rs = mysqli_query($conn, $sql) or die(mysqli_error($conn));
    
    if(mysqli_num_rows($rs) > 0) {
      header("location:". $_SERVER['PHP_SELF'] . "?msg=" . urlencode("Record already exist!"));
    } else {
      $sql = "INSERT INTO Customers (custID, custName, custPswd, custGender) VALUES '
            . "('" . $_POST['tfID'] . "', '" . $_POST['tfName'] . "', '" . $_POST['tfPswd'] . "', '" . $_POST['rbGender'] . "')";
      mysqli_query($conn, $sql) or die (mysqli_error($conn));
      
      if(mysqli_affected_rows($conn) > 0)
        header("location:". $_SERVER['PHP_SELF'] . "?msg=" . urlencode("A record is added successfully"));
    }
  } else {
?>
  <h2>Add a new customer</h2>
  <?php if(isset($_GET['msg'])) echo "<h3 style='color:blue;'>".$_GET['msg']."</h3>"; ?>
  <form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
    <p>Customer ID <input type="text" name="tfID" /></p>
    <p>Customer Name <input type="text" name="tfName" /></p>
    <p>Password <input type="password" name="tfPswd"/></p>
    <p>Gender
      <label><input type="radio" name="rbGender" value="M" checked />Male</label>
      <label><input type="radio" name="rbGender" value="F" />Female</label>
    </p>
    <p><input type="submit" value="Add New Record" /></p>
  </form>
<?php } ?>

主列表顯示頁 (Lab05_1a.php)
<?php
  require_once('Connections/conn.php');
  $sql = "SELECT * FROM Customers";
  $rs = mysqli_query($conn, $sql);
  echo '<table border="1"><tr><th>Action</th><th>Cust ID</th><th>Cust Name</th><th>Cust Password</th><th>Cust Gender</th></tr>';

  while($rc = mysqli_fetch_assoc($rs)) {
    printf('<tr><td><a href="Lab05_1b.php?custID=%s">Delete Record</a></td><td>%s</td><td>%s</td><td>%s</td><td>%s</td></tr>',
           $rc['custID'], $rc['custID'], $rc['custName'], $rc['custPswd'], $rc['custGender']);
  }
  echo "</table>";
  mysqli_free_result($rs);
?>
後端刪除處理頁 (Lab05_1b.php)
<?php
  require_once('Connections/conn.php');
  $sql = "DELETE FROM Customers WHERE custID='" . $_REQUEST['custID'] . "'";
  mysqli_query($conn, $sql) or die(mysqli_error($conn));
  header("location:Lab05_1a.php");
?>

前端按鈕與 JavaScript 觸發頁 (Lab05_2a.php)
<script language="JavaScript" type="text/javascript">
function setValue(n) {
  document.getElementById('custID').value = n;
  document.forms[0].submit();
}
</script>

<?php
  require_once('Connections/conn.php');
  $sql = "SELECT * FROM Customers";
  $rs = mysqli_query($conn, $sql);
  echo '<form method="post" action="Lab05_2b.php">';
  echo '<table border="1"><tr><th>Action</th><th>Cust ID</th><th>Cust Name</th><th>Cust Password</th><th>Cust Gender</th></tr>';

  while($rc = mysqli_fetch_assoc($rs)) {
    printf('<tr><td><input type="button" value="Delete Record" onclick="setValue(\'%s\');" /></td><td>%s</td><td>%s</td><td>%s</td><td>%s</td></tr>',
           $rc['custID'], $rc['custID'], $rc['custName'], $rc['custPswd'], $rc['custGender']);
  }
  echo '</table> <input type="hidden" name="custID" id="custID" value="" /></form>';
  mysqli_free_result($rs);
?>
後端處理頁 (Lab05_2b.php)
<?php
  require_once('Connections/conn.php');
  $sql = "DELETE FROM Customers WHERE custID='" . $_POST['custID'] . "'";
  mysqli_query($conn, $sql) or die(mysqli_error($conn));
  header("location:Lab05_2a.php");
?>

列表與回填編輯頁 (Lab05_3a.php)
<?php
  require_once('Connections/conn.php');
  $sql = "SELECT * FROM Customers";
  $rs = mysqli_query($conn, $sql);
  echo '<table border="1"><tr><th>Action</th><th>Cust ID</th><th>Cust Name</th><th>Cust Password</th><th>Cust Gender</th></tr>';
  while($rc = mysqli_fetch_assoc($rs)) {
    printf('<tr><td><a href="Lab05_3a.php?custID=%s">Update Record</a></td><td>%s</td><td>%s</td><td>%s</td><td>%s</td></tr>',
           $rc['custID'], $rc['custID'], $rc['custName'], $rc['custPswd'], $rc['custGender']);
  }
  echo "</table><br />";
  mysqli_free_result($rs);

  // 判斷是否點擊了修改連結
  if (isset($_GET['custID'])) {
    $sql = "SELECT * FROM Customers WHERE custID='" . $_GET['custID'] . "'";
    $rs = mysqli_query($conn, $sql);
    $rc = mysqli_fetch_assoc($rs);
    $m_check = ($rc['custGender'] == "M") ? 'checked="checked"' : '';
    $f_check = ($rc['custGender'] == "F") ? 'checked="checked"' : '';

    // 使用 heredoc 語法渲染帶有舊資料的表單
    printf('
    <form method="post" action="Lab05_3b.php">
      <p>Customer ID <input type="text" name="tfID" readonly="readonly" value="%s"/></p>
      <p>Customer Name <input type="text" name="tfName" value="%s"/></p>
      <p>Password <input type="password" name="tfPswd" value="%s"/></p>
      <p>Gender <label><input type="radio" value="M" name="rbGender" %s/>Male </label>
                <label><input type="radio" value="F" name="rbGender" %s/>Female</label></p>
      <p><input type="submit" value="Update Record" /></p>
    </form>', $rc['custID'], $rc['custName'], $rc['custPswd'], $m_check, $f_check);
  }
?>
資料庫更新後端頁 (Lab05_3b.php)
<?php
  require_once('Connections/conn.php');
  extract($_POST);
  $sql = "UPDATE Customers SET custName='$tfName', custPswd='$tfPswd', custGender='$rbGender' WHERE custID='$tfID'";
  mysqli_query($conn, $sql) or die(mysqli_error($conn));
  header("location:Lab05_3a.php");
?>