php验证表单不发送电子邮件

Question

I am trying to make an HTML form work.

My frontend code is this:

<form action="/form_validation.php" target="_blank">
    <p><input class="w3-input w3-padding-16" type="text" placeholder="name" required name="name"></p>
    <p><input class="w3-input w3-padding-16" type="text" placeholder="email" required name="email"></p>
    <p><input class="w3-input w3-padding-16" type="text" placeholder="subject" required name="subject"></p>
    <p><input class="w3-input w3-padding-16" type="text" placeholder="comment" required name="comment"></p>
    <p>
        <button class="w3-button w3-light-grey w3-padding-large" type="submit">
            <i class="fa fa-paper-plane"></i> SEND MESSAGE
        </button>
    </p>
</form>
<p><?php echo $feedbackmsg;?></p>

and the file form_validation.php contains this:

<?php

$nameErr = $emailErr = $commentErr = $subjectErr = "";
$name = $email = $comment = $subject = "";
$feedbackmsg = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (isset($_POST['submit'])) {
        if (empty($_POST["name"])) {
            $nameErr = "*Name is required";
        } else {
            $name = validate($_POST["name"]);
            if (!preg_match("/^[a-zA-Z ]*$/", $name)) {
                $nameErr = "*Only letters and white space allowed";
            }
        }

        if (empty($_POST["subject"])) {
            $subjectErr = "*Subject is required";
        } else {
            $subject = validate($_POST["subject"]);
            if (!preg_match("/^[a-zA-Z ]*$/", $subject)) {
                $SubjectErr = "*Only letters and white space allowed";
            }
        }

        if (empty($_POST["email"])) {
            $emailErr = "*Email is required";
        } else {
            $email = validate($_POST["email"]);
            if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email)) {
                $emailErr = "*Invalid email format";
            }
        }

        if (empty($_POST["comment"])) {
            $commentErr = "*Write Me something";
        } else {
            $comment = validate($_POST["comment"]);
        }

        if (empty($nameErr) && empty($emailErr) && empty($commentErr)) {
            $to = "[e-mail]";
            $subject = $name;
            mail($to, $subject, $comment, $email);
            $feedbackmsg = "Your message has sent,<br> thanks";
        }
    }
}

So when action triggered returns back a blank page with the following url with my summury: mysite.com/form_validation.php?name=anastasios&email=myemail%40hotmail.com&subject=mysubject&comment=ena+dio+ena+dio

I think this shoyld be normal. but why I dont have any email if it works properly? Any thoughts? thanks a lot

Answer 1

All of your logic is wrapped in this condition:

if ($_SERVER["REQUEST_METHOD"] == "POST")

And this condition (as well as subsequent conditions therein, if the code got to them) is false because you're using GET instead of POST. Specify the POST method in your form:

<form action="/form_validation.php" target="_blank" method="post">