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$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
  $nameErr = "Only letters and white space allowed"; 
}

$email = test_input($_POST["email"]);
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
  $emailErr = "Invalid email format"; 
}

$website = test_input($_POST["website"]);
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
  $websiteErr = "Invalid URL"; 
}

<?php
// Define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
   if (empty($_POST["name"])) {
      $nameErr = "Name is required";
      } else {
         $name = test_input($_POST["name"]);
         // Check if name only contains letters and whitespace
         if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
         $nameErr = "Only letters and white space allowed"; 
         }
     }

   if (empty($_POST["email"])) {
      $emailErr = "Email is required";
   } else {
      $email = test_input($_POST["email"]);
      // Check if e-mail address is well-formed
      if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) {
         $emailErr = "Invalid email format"; 
      }
   }

   if (empty($_POST["website"])) {
      $website = "";
   } else {
      $website = test_input($_POST["website"]);
      // Check if URL address syntax is valid
     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
         $websiteErr = "Invalid URL"; 
      }
   }
}
?>

$websiteErr = "Invalid URL address";
}
}

if (empty($_POST["comment"])) {
   $comment = "";
} else {
   $comment = test_input($_POST["comment"]);
}

if (empty($_POST["gender"])) {
   $genderErr = "Gender is required";
} else {
   $gender = test_input($_POST["gender"]);
}
}
?>