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demo_form_validation_complete.php:

<!DOCTYPE HTML>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["name"])) {
    $nameErr = "姓名必填";
  } else {
    $name = test_input($_POST["name"]);
    // check if name only contains letters and whitespace
    if (!preg_match("/^[a-zA-Z-' ]*$/",$name)) {
      $nameErr = "只允许字母和空格";
    }
  }

if (empty($_POST["email"])) {
    $emailErr = "邮箱必填";
  } else {
    $email = test_input($_POST["email"]);
    // check if e-mail address is well-formed
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      $emailErr = "邮箱格式不正确";
    }
  }

if (empty($_POST["website"])) {
    $website = "";
  } else {
    $website = test_input($_POST["website"]);
    // check if URL address syntax is valid (this regular expression also allows dashes in the URL)
    if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
      $websiteErr = "网址无效";
    }
  }

if (empty($_POST["comment"])) {
    $comment = "";
  } else {
    $comment = test_input($_POST["comment"]);
  }

if (empty($_POST["gender"])) {
    $genderErr = "Gender is required";
  } else {
    $gender = test_input($_POST["gender"]);
  }
}

function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>

<h2>PHP 表单验证示例</h2>
<p><span class="error">* 必填字段</span></p>
<form method="post" action="/demo/demo_form_validation_complete.php">
  姓名: <input type="text" name="name" value="<?php echo $name;?>">
  <span class="error">* <?php echo $nameErr;?></span>
  <br><br>
  邮箱: <input type="text" name="email" value="<?php echo $email;?>">
  <span class="error">* <?php echo $emailErr;?></span>
  <br><br>
  网址: <input type="text" name="website" value="<?php echo $website;?>">
  <span class="error"><?php echo $websiteErr;?></span>
  <br><br>
  评论: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
  <br><br>
  性别:
  <input type="radio" name="gender"  value="女生" <?php if (isset($gender) && $gender=="女生") echo "checked";?>>女生
  <input type="radio" name="gender"  value="男生" <?php if (isset($gender) && $gender=="男生") echo "checked";?>>男生
  <input type="radio" name="gender"  value="其他" <?php if (isset($gender) && $gender=="其他") echo "checked";?>>其他
  <span class="error">* </span>
  <br><br>
  <input type="submit" name="submit" value="提交">
</form>

<?php
echo "<h2>你的输入:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>
</body>
</html>