Wu Yuxiong - born natural development of learning PHP: Form - Required Field

? < PHP
 // define variables and defaults to a null value 
$ nameErr = $ emailErr = $ genderErr = $ websiteErr = "" ;
 $ name = $ Email = $ Gender = $ the Comment = $ Website = "" ; 

IF ( $ _SERVER [ "REQUEST_METHOD"] == "the POST" ) {
   IF ( empty ( $ _POST [ "name" ])) {
     $ nameErr = "name is required." ; 
  } the else {
     $ name = test_input ( $ _POST["name"]);
  }

  if (empty($_POST["email"])) {
    $emailErr = "邮箱是必需的。";
  } else {
    $email = test_input($_POST["email"]);
  }

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

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

  if (empty($_POST["gender"])) {
    $genderErr = "性别是必需的。";
  } else {
    $gender = test_input($_POST["gender"]);
  }
}
?>

<! DOCTYPE the HTML> 
<HTML> 
<head> 
<Meta charset = "UTF-. 8"> 
<title> novice tutorial (runoob.com) </ title> 
<style> 
.error {Color: # FF0000;} 
</ style > 
</ head> 
<body> 

<? PHP
 // define variables and defaults to a null value 
$ nameErr = $ emailErr = $ genderErr = $ websiteErr = "" ;
 $ name = $ Email = $ Gender = $ the Comment = $ Website = "" ; 

IF ( $ _SERVER [ "REQUEST_METHOD"] == "POST") {
   IF ( empty ( $ _POST [ "name" ])) {
       $ nameErr = "name is required." ; 
   } the else {
       $ name = test_input ( $ _POST [ "name" ]); 
   } 

   IF ( empty ( $ _POST [ "in email" ])) {
       $ emailErr = "mailbox is required." ; 
   } the else {
       $ in email = test_input ( $ _POST [ "in email" ]); 
   } 

   IF ( empty ( $ _POST [ "Website"])) {
      $website = "";
   } else {
      $website = test_input($_POST["website"]);
   }

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

   if (empty($_POST["gender"])) {
      $genderErr = "性别是必须的。";
   } else {
      $gender = test_input($_POST["gender"]);
   }
}

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

<h2>PHP 表单验证实例</h2>
<p><span class="error">* 必填字段。</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']);?>"> 
   名字: <input type="text" name="name">
   <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
   E-mail: <input type="text" name="email">
   <span class="error">* <?php echo $emailErr;?></span>
   <br><br>
   网址: <input type="text" name="website">
   <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   备注: <textarea name="comment" rows="5" cols="40"></textarea>
   <br><br>
   性别:
   <input type="radio" name="gender" value="female">女
   <input type="radio" name="gender" value="male">男
   <span class="error">* <?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>

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

</body>
</html>

Wu Yuxiong - born natural development of learning PHP: Form - Required Field

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