按“发送”后PHP变量未打印出来

form_过程。php

    <?php

// define variables and set to empty values
$name_error = $email_error = $phone_error = "";
$name = $email = $phone = $message = $success = "";

//form is submitted with POST method
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (empty($_POST["name"])) {
        $name_error = "Name is required";
    } else {
        $name = test_input($_POST["name"]);
        // check if name only contains letters and whitespace
        if (!preg_match("/^[a-zA-Z ]*$/", $name)) {
            $name_error = "Only letters and white space allowed";
        }
    }

    if (empty($_POST["email"])) {
        $email_error = "Email is required";
    } else {
        $email = test_input($_POST["email"]);
        // check if e-mail address is well-formed
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            $email_error = "Invalid email format";
        }
    }

    if (empty($_POST["phone"])) {
        $phone_error = "Phone is required";
    } else {
        $phone = test_input($_POST["phone"]);
        // check if e-mail address is well-formed
        if (!preg_match("/^(\d[\s-]?)?[\(\[\s-]{0,2}?\d{3}[\)\]\s-]{0,2}?\d{3}[\s-]?\d{4}$/i", $phone)) {
            $phone_error = "Invalid phone number";
        }
    }


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

    if ($name_error == '' and $email_error == '' and $phone_error == '') {
        $message_body = '';
        unset($_POST['submit']);
        foreach ($_POST as $key => $value) {
            $message_body .= "$key: $value\n";
        }

        $to = 'thisura812@yahoo.com';
        $subject = 'Contact Form Submit';
        if (mail($to, $subject, $message_body)) {
            $success = "Message sent, thank you for contacting us!";
            $name = $email = $phone = $message = '';
        }
    }

}

function test_input($data)
{
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);

    return $data;
}

?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="form.css" type="text/css">
</head>
<body>

<div class="container5">
    <form id="contact" action="form_process.php" method="POST">
        <h3>Contact</h3>
        <h4>Contact us today, and get reply with in 24 hours!</h4>
        <fieldset>
            <input placeholder="Your name" type="text" name="name" tabindex="1" autofocus>
            <span class="error"><?= $name_error ?></span>
        </fieldset>
        <fieldset>
            <input placeholder="Your Email Address" type="text" name="email" tabindex="2">
            <span class="error"><?= $email_error ?></span>
        </fieldset>
        <fieldset>
            <input placeholder="Your Phone Number" type="text" name="phone" tabindex="3">
            <span class="error"><?= $phone_error ?></span>
        </fieldset>
        <fieldset>
          <textarea name="message" tabindex="5">
          </textarea>
        </fieldset>
        <fieldset>
            <input class=sendButton type="submit" value="Send">
        </fieldset>
        <div class="success"><?= $success ?></div>
    </form>
</div>
</body>
</html>

类型css

@import url(http://fonts.googleapis.com/css?family=Open+Sans:400italic,400,300,600);

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-font-smoothing: antialiased;
    -o-font-smoothing: antialiased;
    font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body {
    font-family: "Open Sans", Helvetica, Arial, sans-serif;
    font-weight: 300;
    font-size: 12px;
    line-height: 30px;
    color: #777;
    /*  background:#0CF;*/
}

.error {
    color: red;
}

.success {
    color: #ff9966;
    text-align: center;
    font-weight: bold;
    font-size: 14px;
}

.container5 {
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    position: relative;
    float: left;
}

#contact input[type="text"], #contact input[type="email"], #contact input[type="tel"], #contact input[type="url"], #contact textarea, #contact button[type="submit"] {
    font: 400 12px/16px "Open Sans", Helvetica, Arial, sans-serif;
}

#contact {
    background: #F9F9F9;
    padding: 25px;
    margin: 0;
}

#contact h3 {
    color: #F96;
    display: block;
    font-size: 30px;
    font-weight: 400;
}

#contact h4 {
    margin: 5px 0 15px;
    display: block;
    font-size: 13px;
}

fieldset {
    border: medium none !important;
    margin: 0 0 10px;
    min-width: 100%;
    padding: 0;
    width: 100%;
}

#contact input[type="text"], #contact input[type="email"], #contact input[type="tel"], #contact input[type="url"], #contact textarea {
    width: 100%;
    border: 1px solid #CCC;
    background: #FFF;
    margin: 0 0 5px;
    padding: 10px;
}

#contact input[type="text"]:hover, #contact input[type="email"]:hover, #contact input[type="tel"]:hover, #contact input[type="url"]:hover, #contact textarea:hover {
    -webkit-transition: border-color 0.3s ease-in-out;
    -moz-transition: border-color 0.3s ease-in-out;
    transition: border-color 0.3s ease-in-out;
    border: 1px solid #AAA;
}

#contact textarea {
    height: 100px;
    max-width: 100%;
    resize: none;
}

#contact button[type="submit"] {
    cursor: pointer;
    width: 100%;
    border: none;
    background: #0CF;
    color: #FFF;
    margin: 0 0 5px;
    padding: 10px;
    font-size: 15px;
}

#contact button[type="submit"]:hover {
    background: #09C;
    -webkit-transition: background 0.3s ease-in-out;
    -moz-transition: background 0.3s ease-in-out;
    transition: background-color 0.3s ease-in-out;
}

#contact button[type="submit"]:active {
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
}

#contact input:focus, #contact textarea:focus {
    outline: 0;
    border: 1px solid #999;
}

::-webkit-input-placeholder {
    color: #888;
}

:-moz-placeholder {
    color: #888;
}

::-moz-placeholder {
    color: #888;
}

:-ms-input-placeholder {
    color: #888;
}

#sendButton {
    background-color: rgba(204, 204, 204, 0.52);
    color: black;
    width: 60px;
    font-weight: bold;
}

我已经测试过了,在下面的屏幕上,我刚刚添加了一个合适的文件名,它工作了。