$email = test_input($_POST["email"]);
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
  $emailErr = "Email xato yozildi"; 
}

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

<?php
// massiv
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";
 
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (empty($_POST["name"])) {
    $nameErr = "Nomini yozing";
  } else {
    $name = test_input($_POST["name"]);
    // nomni tekshirish
    if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
      $nameErr = "Faqat harf va belgilangan simvollar"; 
    }
  }
 
  if (empty($_POST["email"])) {
    $emailErr = "Email yozish kerak";
  } else {
    $email = test_input($_POST["email"]);
    // email togri formatdaligini tekshiramiz
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
      $emailErr = "Email xato"; 
    }
  }
 
  if (empty($_POST["website"])) {
    $website = "";
  } else {
    $website = test_input($_POST["website"]);
    // URLni tekshirish
    if (!preg_match("/\b(??:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) {
      $websiteErr = "URL notogri"; 
    }
  }
 
  if (empty($_POST["comment"])) {
    $comment = "";
  } else {
    $comment = test_input($_POST["comment"]);
  }
 
  if (empty($_POST["gender"])) {
    $genderErr = "Jins tanlang";
  } else {
    $gender = test_input($_POST["gender"]);
  }
}
?>