Undefined variable even after using isset - php

Question

I'm getting the following error for a contact form
Notice: Undefined variable: sumNums in C:\xampp\htdocs\tedx\contact.php on line 45
I've already tried 'isseting' it.
Below is my HTML markup regarding this.
<form class="contact-form" method="post" action="contact.php" name="contactform" id="contactform">
<div class="row">
<div class="large-6 columns">
<div class="row">
<div class="large-12 columns">
<label>Name<small class="astrix">*</small>
<input type="text" id="name" name="name" />
</label>
</div>
</div>
<div class="row">
<div class="large-12 columns">
<label>Email<small class="astrix">*</small>
<input type="text" id="email" name="email" />
</label>
</div>
</div>
<div class="row">
<div class="large-12 columns">
<label>Subject<small class="astrix">*</small>
<input type="text" id="subject" name="subject" />
</label>
</div>
</div>
</div>
<div class="large-6 columns">
<label>Message<small class="astrix">*</small>
<textarea cols="30" rows="8" id="comments" name="comments"></textarea>
</label>
</div>
</div>
<div class="row captcha">
<div class="large-6 columns">
<label for="captcha-code">Enter the following sum<small class="astrix">*</small><br>
<span class="captcha-chars" name="captcha-chars">
<span name="num1" id="num1">
<?php
$num1 = rand(1, 9);
echo $num1;
?>
</span>
+
<span name="num2" id="num2">
<?php
$num2 = rand(1, 9);
echo $num2;
?>
</span>
<?php $sumNums = $num1+$num2; ?>
<input type="hidden" value="<?php echo $sumNums; ?>" name="sunNums" id="sumNums">
</span>
<input type="text" id="verify" name="verify">
</label>
</div>
<div class="large-6 columns mt-25">
<button type="submit" id="submit" class="submit"><img src="img/btn-submit.png" alt=""></button>
</div>
</div>
</form>
And the PHP:
<?php
if(!$_POST) exit;
// Email address verification, do not edit.
function isEmail($email) {
return(preg_match("/^[-_.[:alnum:]]+#((([[:alnum:]]|[[:alnum:]][[:alnum:]-]*[[:alnum:]])\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i",$email));
}
if (!defined("PHP_EOL")) define("PHP_EOL", "\r\n");
$name = trim($_POST['name']);
$email = trim($_POST['email']);
$subject = trim($_POST['subject']);
$comments = trim(strip_tags($_POST['comments'], '<p><b><a><i>'));
$verify = trim($_POST['verify']);
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}
if(trim($name) == '') {
echo '<div class="error_message"><i class="fi-x"></i>You must enter your name.</div>';
exit();
} else if(!ctype_alpha($name)) {
echo '<div class="error_message"><i class="fi-x"></i>Your name should\'t contain digits or speicla characters</div>';
exit();
} else if(trim($email) == '') {
echo '<div class="error_message"><i class="fi-x"></i>You must enter your email ID</div>';
exit();
} else if(!isEmail($email)) {
echo '<div class="error_message"><i class="fi-x"></i>You have entered an invalid email ID, try again.</div>';
exit();
}
if(trim($subject) == '') {
echo '<div class="error_message"><i class="fi-x"></i>You must enter a subject.</div>';
exit();
} else if(!ctype_alpha($subject)) {
echo '<div class="error_message"><i class="fi-x"></i>Your subject should\'t contain digits or speicla characters</div>';
exit();
} else if(trim($comments) == '') {
echo '<div class="error_message"><i class="fi-x"></i>You must enter a message.</div>';
exit();
} else if(!isset($verify) || trim($verify) == '') {
echo '<div class="error_message"><i class="fi-x"></i>You must enter the verification number.</div>';
exit();
} else if(trim($verify) != $sumNums) {
echo '<div class="error_message"><i class="fi-x"></i>The verification number you entered is incorrect.</div>';
exit();
}
if(get_magic_quotes_gpc()) {
$comments = stripslashes($comments);
}
// Configuration option.
// Enter the email address that you want to emails to be sent to.
// Example $address = "joe.doe#yourdomain.com";
//$address = "example#themeforest.net";
$address = "njshah#aixsol.com";
// Configuration option.
// i.e. The standard subject will appear as, "You've been contacted by John Doe."
// Example, $e_subject = '$name . ' has contacted you via Your Website.';
$e_subject = 'You\'ve been contacted by ' . $name . '.';
// Configuration option.
// You can change this if you feel that you need to.
// Developers, you may wish to add more fields to the form, in which case you must be sure to add them here.
$e_body = "You have been contacted by $name with regards to $subject, their additional message is as follows." . PHP_EOL . PHP_EOL;
$e_content = "\"$comments\"" . PHP_EOL . PHP_EOL;
$e_reply = "You can contact $name via email, $email.";
$msg = wordwrap( $e_body . $e_content . $e_reply, 70 );
$headers = "From: $email" . PHP_EOL;
$headers .= "Reply-To: $email" . PHP_EOL;
$headers .= "MIME-Version: 1.0" . PHP_EOL;
$headers .= "Content-type: text/plain; charset=utf-8" . PHP_EOL;
$headers .= "Content-Transfer-Encoding: quoted-printable" . PHP_EOL;
if(mail($address, $e_subject, $msg, $headers)) {
// Email has sent successfully, echo a success page.
echo "<div id='success_page' class='success_message'>";
echo "<p><i class='fi-check'></i>Message sent successfully.";
echo "Thank you <strong>$name</strong>, your message has been submitted to us.</p>";
echo "</div>";
} else {
echo 'ERROR!';
}
How do I solve this issue?

Answer 1

You need to answer yourself a question about the line below. Will the $sumNums be defined if the POST isn't submitted?
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}

Answer 2

In form you gave wrong name for sunNums it should be sumNums
So, Replace
<input type="hidden" value="<?php echo $sumNums; ?>" name="sunNums" id="sumNums">
with
<input type="hidden" value="<?php echo $sumNums; ?>" name="sumNums" id="sumNums">
I have just changed the name attribute.

Answer 3

Your input has
name="sunNums"
and you are using
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}

Answer 4

in HTML name is sunNums
<input type="hidden" value="<?php echo $sumNums; ?>" name="sunNums" id="sumNums">
but in PHP you use sumNums
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}

Answer 5

Problem is this:
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}
$sumNums variable is not defined. There is no such index in $_POST.

Answer 6

You can initialize the value
$sumNums = '';
before
if(isset($_POST['sumNums'])) {$sumNums = $_POST['sumNums'];}
Otherwise, you can also replace
} else if(trim($verify) != $sumNums) {
by
} else if(isset($sumNums) && trim($verify) != $sumNums) {
I hope it will help you :)

Answer 7

REPLACE:
<input type="hidden" value="<?php echo $sumNums; ?>" name="sunNums" id="sumNums">
TO
<input type="hidden" value="<?php echo $sumNums; ?>" name="sumNums" id="sumNums">