php联系表单验证，在没有错误和成功的情况下停止显示表单

Question

Here's my code:

<?php

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

    if (empty($_POST["yourname"])) {
        $yournameErr = "Name is required";
    } else {
        $yourname = test_input($_POST["yourname"]);
    }

    if (empty($_POST["email"])) {
        $emailErr = "Email is required";
    } else {
        $email = test_input($_POST["email"]);
        // check if e-mail address syntax is valid
        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email)) {
            $emailErr = "Invalid email format";
        }
    }

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

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

I have got to the point where it doesn't show errors but I probably didn't explain myself too clearly. After the point at which it doesn't show error messages anymore, I would like the form to no longer appear and then I can put something down like "Successful." However I can't seem to achieve this.

my form is :

    <form action="contact.php" name="Form1" id="Form1" method="post">
<div>
<label>Your Name:</label>
<br />
<input type="text" name="yourname" id="yourname" placeholder="Full Name" 
    style="border:1;  border-color:#000000; " />
<span class="error">* <?php echo $yournameErr;?></span>
</div>
    <br />
<br />
<div>
<label> Email :</label> <br />
<input name="email" type="text" id="email" size="20" placeholder="Email" 
    style="border:1;  border-color:#000000; " />
<span class="error">* <?php echo $emailErr;?></span>
</div>
<br />
<br />
<div>
<label> Subject : </label><br />
<input name="subject" type="text" id="subject" size="20" placeholder="Subject" 
    style="border:1;  border-color:#000000; "  />
</div>
<br />
<br />
<div>
<label> Message :<br /> </label>
<textarea rows="5" cols="40" name="message" type="text" id="message" 
    placeholder="The message you want to send to us." style="border:1;  border-  
    color:#000000 " >
</textarea>
<span class="error">* <?php echo $messageErr;?></span>
</div> 
<br />
<br />
<div>
<input type="submit" name="button" id="button" style="border:1; border-
    color:#999999; " value="SEND"/>
</div>
</form>

Answer 1

What if you put your errors in an array and put a condition that check that array size and if it is 0 (no errors) echo the success message and don't show the form else join the errors and print it out.

Maybe like this:

contact.php

<?php
$error = array();
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (empty($_POST["yourname"])) {
        $error['name'] = "Name is required";
    } else {
        $yourname = test_input($_POST["yourname"]);
    }

    if (empty($_POST["email"])) {
        $error['email'] = "Email is required";
    } else {
        $email = test_input($_POST["email"]);
        // check if e-mail address syntax is valid
        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email)) {
            $error['email'] = "Invalid email format";
        }
    }

    if (empty($_POST["message"])) {
        $error['message'] = "Message is required";
    } else {
        $message = test_input($_POST["message"]);
    }

    if (!count($error)) {
         $noError = true;
    }
}

$successMessage = isset($noError) ? 'Successful.' : '';

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

function getErrorMessage($type, $error)
{
    return isset($error[$type]) ? $error[$type] : '';
}

if ($successMessage) {
    echo $successMessage;
} else {
?>
<form action="contact.php" name="Form1" id="Form1" method="post">
    <div>
        <label>Your Name:</label>
        <br/>
        <input type="text" name="yourname" id="yourname" placeholder="Full Name"
               style="border:1px;  border-color:#000000; "/>
        <span class="error">* <?php echo getErrorMessage('name', $error); ?></span>
    </div>
    <br/>
    <br/>

    <div>
        <label> Email :</label> <br/>
        <input name="email" type="text" id="email" size="20" placeholder="Email"
               style="border:1px;  border-color:#000000; "/>
        <span class="error">* <?php echo getErrorMessage('email', $error); ?></span>
    </div>
    <br/>
    <br/>

    <div>
        <label> Subject : </label><br/>
        <input name="subject" type="text" id="subject" size="20" placeholder="Subject"
               style="border:1px;  border-color:#000000; "/>
    </div>
    <br/>
    <br/>

    <div>
        <label> Message :<br/> </label>
        <textarea rows="5" cols="40" name="message" type="text" id="message"
                  placeholder="The message you want to send to us." style="border:1px;  border-  
    color:#000000 "></textarea>
        <span class="error">* <?php echo getErrorMessage('message', $error); ?></span>
    </div>
    <br/>
    <br/>

    <div>
        <input type="submit" name="button" id="button" style="border:1px; border-
    color:#999999; " value="SEND"/>
    </div>
</form>
<?php } ?>