如何验证电子邮件地址[重复]

Question

Possible Duplicate:
How to validate an email address in PHP

I was wondering someone can help me please.

I need to validate the email address for the below code but am having problems.

<?php

if ($_POST) {

    $expected = array('name', 'email', 'emailmessage');
    $validation = array(
        'name'          => 'Please provide your full name',
        'email'         => 'Please provide your valid email address',
        'emailmessage'  => 'Please provide message'
    );

    $errors = array();
    $output = array();

    foreach($expected as $key) {

        $input = htmlspecialchars($_POST[$key]);

        if (array_key_exists($key, $_POST)) {
            if (empty($_POST[$key])) {
                $errors[$key] = $validation[$key];
            } else {
                $output[$key] = $_POST[$key];
            }
        } else {
            $errors[$key] = $validation[$key];
        }

    }

    if (!empty($errors)) {
        $array = array('error' => true, 'fields' => $errors);
    } else {

        // PROCESS FORM

    // ---------------------------------------------------------
    // BEGIN EDITING
    // ---------------------------------------------------------

    $to = "[e-mail]"; //This is the email address messages will be sent to
    $web_name = "My Test Web Form"; //This is the name of your website that will show in your email inbox

    //get IP address
    $ip = $_SERVER['REMOTE_ADDR'];

    //make time
    $time = time();
    $date = date("r", $time);

    // ---------------------------------------------------------
    // END EDITING
    // ---------------------------------------------------------

    $emailmessage = trim($emailmessage);
    $emailmessage = nl2br($emailmessage);
    $emailmessage = htmlspecialchars($emailmessage);
    $emailmessage = wordwrap($emailmessage, 70);

    //Visible form elements
    $name = $_POST['name']; //Sender's name
    $email = $_POST['email']; //Sender's email
    $emailmessage = htmlspecialchars($_POST['emailmessage']); //Sender's message

    //Setting up email
    $subject = "New Message from $web_name";

    $message = "
                New message from $name <br/><br/>

                Message:<br />
                $emailmessage
                <br/>

                <br/>
                Email: $email<br />
                IP:</strong> <span style=\"color:#990000;\">$ip</span><br />
                Date:</strong> $date

                ";

    $header  = 'MIME-Version: 1.0' . "
";
    $header .= 'Content-type: text/html; charset=utf-8' . "
";
    $header .= 'From:'. $email . " 
";

    $sent = mail($to, $subject, $message, $header);

        //$message = '<div id=message>You have successfully subscribed to our newsletter</div>';
        $array = array('error' => false, 'message' => $message);
    }

    echo json_encode($array);
}

I want the email to validate in the $validation array as my messages are passed through this and need the email validation to do the same.

I was trying to use the following but did not know where to place it or how to call it.

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {

    // email is valid

} else {

    // email is invalid

}

Any help is much apprecaited.

Thank you

Answer 1

You could use it like this:

filter_var($email, FILTER_VALIDATE_EMAIL)  or  die("Email wrong.");

Right after you assigned this exact variable:

$email = $_POST['email'];

Of course this could be structured more sensible, and a nicer error notice would also be possible. But it sounds as if you need more general practice with PHP first.