用HTML和PHP制作表格,但无法弄清楚出了什么问题

I made a form to email the data to an email ID. But upon filling up the form and submitting, the browser is saying:

Server error. The website encountered an error while retrieving http://localhost/process.php.

Here is the code:

form1.html

<html>
<head>
<title>Form</title>
</head>
<body>

<form method = "post" action = "process.php">
Enter your name <input type = "text" name = "namee" id = "namee" value = "enter your name" />
Enter your phone number <input type = "text" name = "phone" id = "phone" />
<br>
<input type  = "submit" value = "post it!" />
</form>


</body>
</html>

process.php

<?php

$person_name = $_POST["namee"];
$person_number = $_POST["phone"];

$to = "example234671_1@gmail.com";
$subject = "form filled up";
$body = $person_name. "<br>" $person_number . "<br>" . $person_name ;


mail($to, $subject, $body);

echo "Thank you!" ;
?>

What is the error??

In order to format email properly, headers using text/html must be used for <br> as line breaks.

Otherwise, your email body will appear as John Doe<br>213-555-0123<br>etc.

Plus, as the others have already stated, a missing concatenate in:

$body = $person_name. "<br>" $person_number . "<br>" . $person_name ;

which should read as:

$body = $person_name. "<br>" . $person_number . "<br>" . $person_name;

Rewrite with added headers:

<?php

$person_name = $_POST["namee"];
$person_number = $_POST["phone"];
$to = "example@gmail.com";
$subject = "form filled up";
$from="email@example.com";
$body = $person_name. "<br>" . $person_number . "<br>" . $person_name;

$header = 'MIME-Version: 1.0' . "
";
$header .= 'Content-type: text/html; charset=iso-8859-1' . "
";
$header .= "From: ". $from . " $from " . "
";

mail($to, $subject, $body, $header);
echo "Thank you!";
?>
$body = $person_name. "<br>" $person_number . "<br>" . $person_name ;

This line is wrong, you're missing a concatenator.

$body = $person_name. "<br>" . $person_number . "<br>" . $person_name ;

There's a syntax error here.

$body = $person_name. "<br>" $person_number . "<br>" . $person_name ;

"<br>" needs to be followed by a concatenation dot, like so:

$body = $person_name. "<br>" . $person_number . "<br>" . $person_name ;

While developing, you'll want to enable displaying php errors though. Have a look at PHP Runtime Configuration.

Like it's already said you missed a concatenation dot but I also see another error.

"<br>" 

is HTML and without the right content type you won't be able to show HTML in your email.

Take a look at http://php.net/manual/en/function.mail.php for more information and examples.

OR use for newlines.