PHP Форма с валидацией

<!DOCTYPE HTML> 
<html>
	<head>
		<style>
			.error {color: #f00;}
		</style>
	</head>
	<body>
		<?php
			$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"]);
					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"]);
					if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
					{
						$emailErr = "Invalid email format";
					}
				}
				
				if(empty($_POST["website"]))
				{
					$website = "";
				}
				else
				{
					$website = test_input($_POST["website"]);
					if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
					{
						$websiteErr = "Invalid URL";
					}
				}
				
				if(empty($_POST["comment"]))
				{
					$comment = "";
				}
				else
				{
					$comment = test_input($_POST["comment"]);
				}
				
				if(empty($_POST["gender"]))
				{
					$gender = "Gender is required";
				}
				else
				{
					$gender = test_input($_POST["gender"]);
				}		
			}
			
			function test_input($data)
			{
				$data = trim($data);
				$data = stripslashes($data);
				$data = htmlspecialchars($data);
				return $data;
			}			
		?>
		<h2>Отправка формы</h2>
		<p><span class="error">* required field.</span></p>
		form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>"
			Name: <input type="text" name="name" value="<?php echo $name; ?>" />
			<span class="error">* <?php echo $nameErr;?></span>
			<br /><br />
			Email: <input type="text" name="email" value="<?php echo $email; ?>" />
			<span class="error">* <?php echo $emailErr;?></span>
			<br /><br />
			Website: <input type="text" name="website" value="<?php echo $website; ?>" />
			<span class="error"><?php echo $websiteErr;?></span>
			<br /><br />
			Comment: &lt;textarea name="comment" rows="5" col="40" ><?php echo $comment; ?>&lt;/textarea><br />
			<br /><br />
			Gender: 
			<input type="radio" name="gender" value="female" <?php if (isset($gender) && $gender=="female") echo "checked"; ?> />Female
			<input type="radio" name="gender" value="male" <?php if (isset($gender) && $gender=="male") echo "checked"; ?>/>Male
			<span class="error">* <?php echo $genderErr;?></span>
			<br /><br />
			<input type="submit" />
		/form
		
		<?php
			echo "<h2>Your Input:</h2>";
			echo $name;
			echo "<br>";
			echo $email;
			echo "<br>";
			echo $website;
			echo "<br>";
			echo $comment;
			echo "<br>";
			echo $gender;
		?>
	</body>
</html>
PHP Форма с валидацией

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