php可选字段代码奇数错误

我正在开发一个php表单，我制作了两个部分，必填字段和可选字段。除了“email”字段外，以下代码运行良好。我把email字段改为可选字段，但不知怎么的，它不是可选的，它的工作原理和必填字段一样。 如果有人能粘贴代码并试一试

非常感谢你的建议

<?php

// Set required fields
$required_fields = array('phone');

$optional_fields = array('name','email');

// set error messages
$error_messages = array(
    'name' => 'Please enter your name, letters only',
    'phone' => 'Please enter a valid phone number',
    'email' => 'Please enter a valid email address',
);

// Set form status
$form_complete = FALSE;

// configure validation array
$validation = array();

// check form submittal
if(!empty($_POST)) {

    // Loop into required fields and make sure they match our needs
    foreach($required_fields as $field) {       
        // the field has been submitted?
    //  if(!array_key_exists($field, $_POST)) array_push($validation, $field);

        // check there is information in the field?
        if($_POST[$field] == '') array_push($validation, $field);

                // validate the phone number supplied
        if($field == 'phone') if(!validate_phone_number($_POST[$field])) array_push($validation, $field);

    }

        //starts here for optional validation   
    foreach($optional_fields as $field){
        if(!array_key_exists($field, $_POST)) array_push($validation, $field);

            // validate the name if supplied
    if($field == 'name') if(!validate_name($_POST[$field])) array_push($validation, $field);


    // validate the email address supplied
    if($field == 'email') if(!validate_email($_POST[$field])) array_push($validation, $field);

    }   // basic validation result
    if(count($validation) == 0) {

        $form_complete = TRUE;
    }
}

//functions for validation different fields
function validate_name($phone = FALSE) {
    return (!preg_match('/[^a-zA-Z ]/', $phone))? TRUE : FALSE;
}

function validate_email($email = FALSE) {
    return (preg_match('/^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i', $email))? TRUE : FALSE;
}

function validate_phone_number($phone = FALSE) {
    return (!preg_match('/\D/', $phone))? TRUE : FALSE;
}

?>



<?php if($form_complete === FALSE): ?> 


  <form id="form" name="form"  method="post" action="">

      <label for="name">Name:</label>
      <input class="inter" type="text" name="name" id='name' value="<?php echo isset($_POST['name'])? $_POST['name'] : ''; ?>"/><?php if(in_array('name', $validation)): ?><span class="phperror"><?php echo $error_messages['name']; ?></span><?php endif; ?>
<p></p>


      <label for="phone">Phone:</label>
      <input  type="text" name="phone" id='phone' value="<?php echo isset($_POST['phone'])? $_POST['phone'] : ''; ?>"/><?php if(in_array('phone', $validation)): ?><span class="phperror"><?php echo $error_messages['phone']; ?></span><?php endif; ?>
<p></p>


      <label for="email">Email:</label>
      <input type="text" name="email" id='email' value="<?php echo isset($_POST['email'])? $_POST['email'] : ''; ?>"/><?php if(in_array('email', $validation)): ?><span class="phperror"><?php echo $error_messages['email']; ?></span><?php endif; ?>
<p></p>
   <input type="submit" value="Send"  />
  </form>


<?php else: ?>
<h2>Your message was sent</h2>
<?php endif; ?>

姓名：
问题就在这方面

// validate the email address supplied
if($field == 'email') if(!validate_email($_POST[$field])) array_push($validation, $field);

它没有检查空的$u帖子['email']

// validate the email address supplied
if($field == 'email' && ! empty($_POST[$field])) if(!validate_email($_POST[$field])) array_push($validation, $field);

现在，它只在$\u POST['email']不为空时触发验证
Dale，非常感谢您的帮助。：-）只是另一个简单的问题，为什么名称字段工作良好？再次感谢您的快速帮助，我会看一看，看看是否能找到答案：）它似乎总是返回true，我只是尝试将此添加到代码底部
，我在底部看到
11
，这意味着两者都已验证。