title: Notice: Undefined index: phone in contact.php on line 17
body: <p>I have read quite a number of prior posts to figure this out, but no error fixes work. Please note that I've added a field to the form to request a contact number, after inserting line 17 the form no longer works. If i take out line 17 the form works, but im not sent the number inputted into the form-field.</p>
  
  <p>Line 17 produces an error on the web page:</p>
  
  <blockquote>
    <p>Notice: Undefined index: phone in /contact.php on line 17</p>
  </blockquote>
  
  <p>This is Line 17:
      $phone = $_POST['phone'];</p>
  
  <p>Here is the entire code:
      
  
  <pre><code>if(!$_POST) exit;
  
  
  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     = $_POST['name'];
  $email    = $_POST['email'];
  $phone    = $_POST['phone'];  //THIS LINE IS LINE 17 CAUSING THE ERROR.
  $comment  = $_POST['comment'];
  
  if(trim($name) == '') {
  echo '&lt;div class="error_message"&gt;Attention! You must enter your name. &lt;/div&gt;';
  exit();
  } else if(trim($email) == '') {
  echo '&lt;div class="error_message"&gt;Attention! Please enter a valid email address.&lt;/div&gt;';
  exit();
  } else if(!isEmail($email)) {
  echo '&lt;div class="error_message"&gt;Attention! You have enter an invalid e-mail address, try again.&lt;/div&gt;';
  exit();
  } 
  
  if(trim($phone) == '') {
  echo '&lt;div class="error_message"&gt;Attention! You must enter a Mobile or  Landline number.&lt;/div&gt;';
  exit();
  }
  
  if(trim($comment) == '') {
  echo '&lt;div class="error_message"&gt;Attention! Please enter your message.&lt;/div&gt;';
  exit();
  }
  
  if(get_magic_quotes_gpc()) {
  $comment = stripslashes($comment);
  }
  
  $address = "joe.doe@yourdomain.com";
  
  $e_subject = 'You\'ve been contacted by ' . $name . '.';
  
  $e_body = "You have been contacted by $name with regards to $subject and the additional message is as follows." . PHP_EOL . PHP_EOL;
  $e_content = "\"$comment\"" . PHP_EOL . PHP_EOL;
  $e_reply = "You can contact $name via email: $email or by calling $phone";
  
  $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)) {
  </code></pre>
  
  <p>// Email has sent successfully, echo a success page.</p>
  
  <pre><code>echo "&lt;div class='ok_message'&gt;&lt;p&gt;Thank you &lt;strong&gt;$name&lt;/strong&gt;, your message has been submitted to us.&lt;/p&gt;&lt;/div&gt;";
  
  } else {
  
  echo '&lt;div class="error_message"&gt;ERROR!&lt;/div&gt;';
  
  }
  </code></pre>
  
  <hr>
  
  <p>If you require the form, please let me know but this has me stumped. </p>
  
  <hr>
  
  <p>The FORM:</p>
  
  <pre><code>&lt;form method="get" action="contact.php" class="form contact-form"&gt;
            &lt;fieldset&gt;
              &lt;h2&gt;Make a Booking&lt;/small&gt;&lt;/h2&gt;
              &lt;div id="message"&gt;&lt;/div&gt;
              &lt;div class="formRow"&gt;
                &lt;div class="textField"&gt;
                  &lt;input type="text" name="name" id="name" placeholder="Your name ..." /&gt;
                &lt;/div&gt;
              &lt;/div&gt;
              &lt;div class="formRow"&gt;
                &lt;div class="textField"&gt;
                  &lt;input type="text" name="email" id="email" placeholder="Your email ..." /&gt;
                &lt;/div&gt;
              &lt;/div&gt;
              &lt;div class="formRow"&gt;
                &lt;div class="textField"&gt;
                  &lt;input type="text" name="phone" id="phone" placeholder="Mobile or Landline ..." /&gt;
                &lt;/div&gt;
              &lt;/div&gt;
              &lt;div class="formRow"&gt;
                &lt;div class="textField"&gt;
                  &lt;textarea cols="20" name="comment" id="comment" rows="4" placeholder="When do you need us ..."&gt;&lt;/textarea&gt;
                &lt;/div&gt;
              &lt;/div&gt;
              &lt;div class="formRow"&gt;
                &lt;button class="btnSmall btn submit right"&gt; &lt;span&gt;Send Message&lt;/span&gt; &lt;/button&gt;
              &lt;/div&gt;
            &lt;/fieldset&gt;
          &lt;/form&gt;
  </code></pre>