title: php script to add emails to text file wont work
body: <p>Okay, so by this script I'm basically trying to make it so once people enter their email address, it notifys the company email saying there is a new subscriber (works) and also adds whatever what was typed into that input to a text file in this format:</p>
  
  <p>email1@gmail.com, email2@gmail.com, email3@gmail.com</p>
  
  <p>As of now I have this, but it's not working (the writing to text file part)</p>
  
  <p>HTML:</p>
  
  <pre><code>        &lt;div class="span12 subscribe"&gt;
              &lt;h3&gt;Subscribe to our newsletter&lt;/h3&gt;
              &lt;p&gt;Sign up now to our newsletter and you'll be one of the first to know when the site is ready:&lt;/p&gt;
              &lt;form class="form-inline" action="assets/sendmail.php" method="post"&gt;
                  &lt;input type="text" name="email" placeholder="Enter your email..."&gt;
                  &lt;button type="submit" class="btn"&gt;Subscribe&lt;/button&gt;
              &lt;/form&gt;
              &lt;div class="success-message"&gt;&lt;/div&gt;
              &lt;div class="error-message"&gt;&lt;/div&gt;
          &lt;/div&gt;
  </code></pre>
  
  <p>PHP:</p>
  
  <pre><code>&lt;?php
  
  
  // Email address verification
  
  function isEmail($email) {
      return(preg_match("/^[-_.[:alnum:]]+@((([[:alnum:]]|[[:alnum:]][[:alnum:]-]*[[:alnum:]])\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$|(([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($_POST) {
  
      // Enter the email where you want to receive the notification when someone subscribes
      $emailTo = 'webmaster@servready.com';
  
      $subscriber_email = ($_POST['email']);
  
      if(!isEmail($subscriber_email)) {
          $array = array();
          $array['valid'] = 0;
          $array['message'] = 'Insert a valid email address!';
          echo json_encode($array);
      }
      else {
          $array = array();
          $array['valid'] = 1;
          $array['message'] = 'Thanks for your subscription!';
          echo json_encode($array);
  
          // Send email
      $subject = 'New Subscriber!';
      $body = "You have a new subscriber!\n\nEmail: " . $subscriber_email;
          // uncomment this to set the From and Reply-To emails, then pass the $headers variable to the "mail" function below
      //$headers = "From: ".$subscriber_email." &lt;" . $subscriber_email . "&gt;" . "\r\n" . "Reply-To: " . $subscriber_email;
      mail($emailTo, $subject, $body);
      }
  
      $data = $_POST['email'] "\n";
      $ret = file_put_contents('assets/data.txt', $data, FILE_APPEND | LOCK_EX);
      if($ret === false) {
          die('There was an error writing this file');
      }
      else {
          echo "$ret bytes written to file";
      }
  
  }
  ?&gt;
  </code></pre>
  
  <p>Basically if I remove this part from the PHP script it works fine (sends an email to the staff email saying theirs a new subscriber with what was entered into the input)</p>
  
  <pre><code>&lt;?php
  $data = $_POST['email'] "\n";
  $ret = file_put_contents('assets/data.txt', $data, FILE_APPEND | LOCK_EX);
  if($ret === false) {
      die('There was an error writing this file');
  }
  else {
      echo "$ret bytes written to file";
  }
  ?&gt;
  </code></pre>