bu formda nerede hata var

 
  function isInjected($str) { 
  	$injections = array('(\n+)', 
  	'(\r+)', 
  	'(\t+)', 
  	'(%0A+)', 
  	'(%0D+)', 
  	'(%08+)', 
  	'(%09+)' 
  	); 
  	$inject = join('|', $injections); 
  	$inject = "/$inject/i"; 
  	if(preg_match($inject,$str)) { 
  		return true; 
  	} 
  	else { 
  		return false; 
  	} 
  } 
   
   
  if (!isset($_REQUEST['email_address'])) { 
  header( "Location: $feedback_page" ); 
  } 
   
   
  elseif (empty($email_address) || empty($comments)) { 
  header( "Location: $error_page" ); 
  } 
   
  elseif ( isInjected($email_address) ) { 
  header( "Location: $error_page" ); 
  } 
   
  else { 
  mail( "$webmaster_email", "Feedback Form Results", 
    $comments, "From: $email_address" ); 
  header( "Location: $thankyou_page" ); 
  }