Php 使用'；如果'；

我目前正在构建一个非常小的“联系人”表单，用于个人网站

表单工作，每个验证“如果”语句单独工作，但是，例如，如果我输入了有效的电子邮件地址和电话号码，但将消息留空，电子邮件仍会发送，我会收到成功消息

我的猜测是将小的“if”语句包含在一个语句中，检查我的必填字段是否为空，尽管我不确定如何正确地执行此操作，因为它将多个“if”嵌套在一个语句中

干杯

<?php 
            // Validation goes here
            $errors = '';
            $success = 'Success! Your message has been sent. You should receive a reply within 48 hours.';

            $email = $_POST['email']; 
            $name = $_POST['thename']; 
            $comments = $_POST['comments'];
            $number = $_POST['number']; 

            if(empty($name) || empty($email) || empty($comments)) {
                $errors .= "Error: please input a name, email address and your message.";
            } else {
                $errors = '';
            }

            if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
                $errors .= "Error: Invalid email address";
            } else {
                $errors = '';
            }

            if (!preg_match("/^\(?0( *\d\)?){9,10}$/", $number)) {
                $errors .= "Error: Invalid phone number";
            } else {
                $errors = '';
            }

        ?>

        <!-- Display red error box or green success box depending on which is true -->
        <?php if(!empty($errors)): ?>
            <div class="validationbox | errorsbox">
                <?php echo $errors; ?>
            </div>
        <?php elseif(empty($errors)): ?>
            <div class="validationbox | successbox">
                <?php echo $success; ?>
            </div>
            <?php 
                $message = ''; // Blank message to start with so we can append to it.

                // Construct the message
                $message .= "
                    Name: {$_POST['thename']};
                    Email: {$_POST['email']};
                    Number: {$_POST['number']};
                    Enquiry-type: {$_POST['enquiry-options']};
                    Message: {$_POST['comments']};
";
                // test@testdomain.com
                $to = 'test-email-deleted-for-stackoverflow'; 
                $subject = 'Message from Portfolio';
                $from = $_POST['thename'];
                // YourSite@domain.com
                $fromEmail = 'test-email-deleted-for-stackoverflow';
                $header = 'From: ' . $from . '<' . $fromEmail . '>';
                mail($to,$subject,$message,$header);
            ?>
        <?php endif; ?>
    <?php endif; ?>

---

根据提供的信息，我认为您应该使用复杂的if-elseif-else语句，如：

`if (condition) {
    code to be executed if this condition is true;
} elseif (condition) {
    code to be executed if this condition is true;
} else {
    code to be executed if all conditions are false;
} `

在您的特殊情况下：

// Validation goes here
                $errors = '';
                $success = 'Success! Your message has been sent. You should receive a reply within 48 hours.';

                $email = $_POST['email']; 
                $name = $_POST['thename']; 
                $comments = $_POST['comments'];
                $number = $_POST['number']; 

                if(empty($name) || empty($email) || empty($comments)) {
                    $errors .= "Error: please input a name, email address and your message.";
                } elseif(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
                    $errors = 'Error:invalid email';
                }elseif(!preg_match("/^\(?0( *\d\)?){9,10}$/", $number){
                    $errors .= "Error: Invalid phone number";

                } else {
                    //Do this on successful validation comes here
                }

---

您的问题是，每次通过一个验证条件时，您都会将

$errors

重置回

'

：

        if(empty($name) || empty($email) || empty($comments)) {
            $errors .= "Error: please input a name, email address and your message.";
        } else {
            $errors = '';
        }

        if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
            $errors .= "Error: Invalid email address";
        } else {
            $errors = '';
        }

        if (!preg_match("/^\(?0( *\d\)?){9,10}$/", $number)) {
            $errors .= "Error: Invalid phone number";
        } else {
            $errors = '';
        }

您不应该这样做，只需将错误消息保留给以前的内容即可。这样，当您到达末尾时，

$errors

将包含所有错误消息的组合字符串。由于可能有多条消息，您可能希望在每条消息的末尾加一个分隔符：

        if(empty($name) || empty($email) || empty($comments)) {
            $errors .= "Error: please input a name, email address and your message.<br>";
        } 

        if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
            $errors .= "Error: Invalid email address<br>";
        } 

        if (!preg_match("/^\(?0( *\d\)?){9,10}$/", $number)) {
            $errors .= "Error: Invalid phone number<br>";
        }

---

尝试下面的代码，它会帮助你

<?php 
            // Validation goes here
            $errors = '';
            $success = 'Success! Your message has been sent. You should receive a reply within 48 hours.';

            $email = $_POST['email']; 
            $name = $_POST['thename']; 
            $comments = $_POST['comments'];
            $number = $_POST['number']; 

            if(empty($name) || empty($email) || empty($comments)) {
                $errors .= "Error: please input a name, email address and your message.";
            } else {
                   if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
                $errors .= "Error: Invalid email address";
            } else {
                $errors = '';
            }

            if (!preg_match("/^\(?0( *\d\)?){9,10}$/", $number)) {
                $errors .= "Error: Invalid phone number";
            } else {
                $errors = '';
            }
            }



        ?>

您需要提供包含或不包含发送电子邮件条件的代码。感谢上面提供的@JBES。我认为您必须删除else子句，因为每次正确的检查都会删除所有以前设置的错误。因此，只需将您的`if（empty（$name）| | empty（$email）| empty（$comments））拆分为'if（empty（$name）| | empty（$comments））{$errors.=“Error:请输入姓名、电子邮件地址和您的邮件。”；}否则{$errors=''；}`将块插入单个错误邮件中，并删除

else

语句。因此，您可以使用$errors作为数组并列出多个错误，例如$errors[]=“无效电子邮件地址”…然后您只需检查计数（$errors）>0要知道表单是否无效，仅当您的电子邮件、评论、姓名不为空时，才检查有效的电子邮件和电话。在代码中，如果您的邮件当时为空$error get message，但您的电子邮件地址是正确的，因此它将进一步变为空，并且邮件已发送如果您需要任何帮助，那么您可以询问Underful！感谢您提供了这样一个有用的示例计划也：）谢谢，非常有帮助：）亚历克斯，我很乐意帮忙。我在这个平台上得到了很多帮助。很高兴回报你的帮助。

<?php 
            // Validation goes here
            $errors = '';
            $success = 'Success! Your message has been sent. You should receive a reply within 48 hours.';

            $email = $_POST['email']; 
            $name = $_POST['thename']; 
            $comments = $_POST['comments'];
            $number = $_POST['number']; 

            if(empty($name) || empty($email) || empty($comments)) {
                $errors .= "Error: please input a name, email address and your message.";
            } else {
                   if (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
                $errors .= "Error: Invalid email address";
            } else {
                $errors = '';
            }

            if (!preg_match("/^\(?0( *\d\)?){9,10}$/", $number)) {
                $errors .= "Error: Invalid phone number";
            } else {
                $errors = '';
            }
            }



        ?>