PHP Decode

<?php 
	// define variables and set to empty values 
	$nameErr = $emailErr = $phoneErr = $inquiryErr = ""; 
	$name = $email = $phone = $inquiry = $email_message = ""; 
	$submitted = 0; 
 
	if ($_SERVER["REQUEST_METHOD"] == "POST") { 
	   if (empty($_POST["name"])) { 
		 $nameErr = "Name is required"; 
	   } else { 
		 $name = clean_data($_POST["name"]); 
		 $fill["name"] = $name; 
		 // check if name only contains letters and whitespace 
		 if (!preg_match("/^[a-zA-Z ]*$/",$name)) { 
		   $nameErr = "Only letters and white space allowed";  
		 } 
	   } 
	    
	   if (empty($_POST["email"])) { 
		 $emailErr = "Email is required"; 
	   } else { 
		 $email = clean_data($_POST["email"]); 
		 $fill["email"] = $email; 
		 // check if e-mail address is well-formed 
		 if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { 
		   $emailErr = "Invalid email format";  
		 } 
	   } 
		  
	   if (empty($_POST["phone"])) { 
		 $phone = ""; 
	   } else { 
		 $phone = clean_data($_POST["phone"]); 
		 $fill["phone"] = $phone; 
		 // check if phone number format is valid 
		 if (ctype_alpha(preg_replace('/[0-9]+/', '',$phone))) { 
		   $phoneErr = "Phone Number Cannot Include Letters";  
		 } 
		 if (!ctype_digit(preg_replace('~[^0-9]~', '',$phone))) { 
		   $phoneErr = "Your Phone Number Does Not Include Digits";  
		 } 
	   } 
 
	   if (empty($_POST["inquiry"])) { 
		 $inquiryErr = "You Cannot Submit an Empty Inquiry"; 
	   } else { 
		 $inquiry = clean_data($_POST["inquiry"]); 
		 $fill["inquiry"] = $inquiry; 
	   } 
	} 
 
	function clean_data($data) { 
		// Strip whitespace (or other characters) from the beginning and end of string 
		$data = trim($data); 
		// Un-quotes quoted string 
		$data = stripslashes($data); 
		// Convert special characters to HTML entities 
		$data = htmlspecialchars($data); 
		return $data; 
	} 
	// Send email if no errors 
	if (isset($fill)) { 
		if (empty($nameErr) && empty($emailErr) && empty($phoneErr) && empty($inquiryErr)) { 
			// Inquiry sent from address below 
			$email_from = "[email protected]"; 
			 
			// Send form contents to address below 
			$email_to = "[email protected]"; 
			 
			// Email message subject 
			$today = date("j F, Y. H:i:s"); 
			$email_subject = "Website Submission [$today]"; 
			 
			function clean_string($string) { 
 
				$bad = array("content-type","bcc:","to:","cc:","href"); 
 
				return str_replace($bad,"",$string); 
 
			} 
 
			$email_message .= "Name: ".clean_string($name)."
"; 
 
			$email_message .= "Email: ".clean_string($email)."
"; 
 
			$email_message .= "Phone: ".clean_string($phone)."
"; 
 
			$email_message .= "Inquiry: ".clean_string($inquiry)."
"; 
			 
			// create email headers 
			$headers = 'From: '.$email_from."
". 
			  
			'Reply-To: '.$email_from."
" . 
			  
			'X-Mailer: PHP/' . phpversion(); 
			  
			@mail($email_to, $email_subject, $email_message, $headers); 
			 
			$submitted = 1; 
		} 
	} 
?> 
<div> 
	<form name="contactus" method="post" action="contact.php"> 
		<div> 
			<span>* Name, Email and Inquiry are required fields.</span> 
		</div> 
		<div> 
			<div> 
				<span>Name</span> 
			</div> 
			<div> 
				<input type="text" name="name" placeholder="Name" value="<?php 
					if (isset($fill["name"]) && $submitted == 0) { 
						echo $fill["name"]; 
					}?>"> 
				<span class="<?php 
					if (empty($nameErr)) { 
						 echo "hidden"; 
					   } else { 
						 echo "error"; 
					} 
				?>"><?php echo $nameErr;?></span> 
			</div> 
		</div> 
		<div> 
			<div> 
				<span>Email</span> 
			</div> 
			<div> 
				<input type="text" name="email" placeholder="Email Address" value="<?php 
					if (isset($fill["email"]) && $submitted == 0) { 
						echo $fill["email"]; 
					}?>"> 
				<span class="<?php 
					if (empty($emailErr)) { 
						 echo "hidden"; 
					   } else { 
						 echo "error"; 
					} 
				?>"><?php echo $emailErr;?></span> 
			</div> 
		</div> 
		<div> 
			<div> 
				<span class="prefix">Phone</span> 
			</div> 
			<div> 
				<input type="text" name="phone" placeholder="Phone Number" value="<?php 
					if (isset($fill["phone"]) && $submitted == 0) { 
						echo $fill["phone"]; 
					}?>"> 
				<span class="<?php 
					if (empty($phoneErr)) { 
						 echo "hidden"; 
					   } else { 
						 echo "error"; 
					} 
				?>"><?php echo $phoneErr;?></span> 
			</div> 
		</div> 
		<div> 
			<div> 
				<span>Inquiry</span> 
			</div> 
			<div> 
				<textarea name="inquiry" placeholder="Enter Your Inquiry Here"><?php 
					if (isset($fill["inquiry"]) && $submitted == 0) { 
						echo $fill["inquiry"]; 
					}?></textarea> 
				<span class="<?php 
					if (empty($inquiryErr)) { 
						 echo "hidden"; 
					   } else { 
						 echo "error"; 
					} 
				?>"><?php echo $inquiryErr;?></span> 
				<div> 
					<input type="submit" value="Submit" class="small button" /> 
				</div> 
			</div> 
		</div> 
	</form> 
			 
	<!-- Success message --> 
	<span class="success <?php if ($submitted == 0) { echo "hidden"; } ?>" >Inquiry <strong>Successfully sent</strong></span> 
</div>