/////////////////////////////////////////////Task9 /////////////////////////////////////////
		ECHO '<H1>Task 9:</H1> <br>';
		
		//The GetProvince function uses ranges to return the province, area for the 
		//postal code that the user have entered.
		function GetProvince($Pcode){	
			$retVal = "";		
			if(0 < intval($Pcode) && intval($Pcode) < 205){$retVal = "Gauteng, Pretoria 1";}
			if(204 < intval($Pcode) && intval($Pcode)  < 699){$retVal = "Mpumalanga, Pretoria 2";}
			if(698 < intval($Pcode) && intval($Pcode)  < 1000){$retVal = "Limpopo, Polokwane/Pietersburg";}
			if(999 < intval($Pcode) && intval($Pcode)  < 1200){$retVal = "Mpumalanga, Pretoria 3";}
			if(1199 < intval($Pcode) && intval($Pcode)  < 1400){$retVal = "Mpumalanga, Nelspruit";}
			if(1399 < intval($Pcode) && intval($Pcode)  < 1438){$retVal = "Gauteng, Germiston";}
			if(1437 < intval($Pcode) && intval($Pcode)  < 1445){$retVal = "Gauteng, Heidelberg";}
			if(1444 < intval($Pcode) && intval($Pcode)  < 1700){$retVal = "Gauteng, Germiston";}
			if(1699 < intval($Pcode) && intval($Pcode)  < 1800){$retVal = "Gauteng, Krugersdorp";}
			if(1799 < intval($Pcode) && intval($Pcode)  < 1871){$retVal = "Gauteng, KDP/Soweto";}
			if(1870 < intval($Pcode) && intval($Pcode)  < 2000){$retVal = "Gauteng, Vanderbijlpark";}
			if(1999 < intval($Pcode) && intval($Pcode)  < 2200){$retVal = "Gauteng, Witspos/Johannesburg";}
			if(2199 < intval($Pcode) && intval($Pcode)  < 2495){$retVal = "Mpumalanga, Pretoria 4";}
			if(2494 < intval($Pcode) && intval($Pcode)  < 2520){$retVal = "North West, Krugersdorp";}
			if(2519 < intval($Pcode) && intval($Pcode)  < 2710){$retVal = "North West, Potchefstroom";}
			if(2709 < intval($Pcode) && intval($Pcode)  < 2900){$retVal = "North West, Mafikeng";}
			if(2899 < intval($Pcode) && intval($Pcode)  < 3200){$retVal = "KwaZulu Natal, Ladysmith";}
			if(3199 < intval($Pcode) && intval($Pcode)  < 3310){$retVal = "KwaZulu Natal, Pietermaritzburg";}
			if(3309 < intval($Pcode) && intval($Pcode)  < 3600){$retVal = "KwaZulu Natal, Ladysmith";}
			if(3599 < intval($Pcode) && intval($Pcode)  < 3800){$retVal = "KwaZulu Natal, Durmail 2";}
			if(3799 < intval($Pcode) && intval($Pcode)  < 3991){$retVal = "KwaZulu Natal, Richards Bay";}
			if(3990 < intval($Pcode) && intval($Pcode)  < 4180){$retVal = "KwaZulu Natal, Durmail 1";}
			if(4179 < intval($Pcode) && intval($Pcode)  < 4300){$retVal = "KwaZulu Natal, Port Shepstone";}
			if(4299 < intval($Pcode) && intval($Pcode)  < 4642){$retVal = "KwaZulu Natal, Durmail 2";}
			if(4641 < intval($Pcode) && intval($Pcode)  < 4731){$retVal = "KwaZulu Natal, Port Shepstone";}
			if(4730 < intval($Pcode) && intval($Pcode)  < 4740){$retVal = "Eastern Cape, Umtata";}
			if(4739 < intval($Pcode) && intval($Pcode)  < 4800){$retVal = "KwaZulu Natal, Port Shepstone";}	
			if(4799 < intval($Pcode) && intval($Pcode)  < 4920){$retVal = "Eastern Cape, Umtata";}	
			if(4919 < intval($Pcode) && intval($Pcode)  < 5050){$retVal = "Eastern Cape, East London";}
			if(5049 < intval($Pcode) && intval($Pcode)  < 5200){$retVal = "Eastern Cape, Umtata";}
			if(5199 < intval($Pcode) && intval($Pcode)  < 5751){$retVal = "Eastern Cape, East London";}
			if(5750 < intval($Pcode) && intval($Pcode)  < 6500){$retVal = "Eastern Cape, Port Elizabeth";}
			if(6499 < intval($Pcode) && intval($Pcode)  < 6700){$retVal = "Western Cape, George";}
			if(6699 < intval($Pcode) && intval($Pcode)  < 6900){$retVal = "Western Cape, Worcester";}
			if(6899 < intval($Pcode) && intval($Pcode)  < 7100){$retVal = "Western Cape, Beaufort West";}
			if(7099 < intval($Pcode) && intval($Pcode)  < 8180){$retVal = "Western Cape, Cape Mail";}
			if(8179 < intval($Pcode) && intval($Pcode)  < 8300){$retVal = "Northern Cape, Upington";}
			if(8299 < intval($Pcode) && intval($Pcode)  < 8800){$retVal = "Northern Cape, Kimberley";}
			if(8799 < intval($Pcode) && intval($Pcode)  < 9000){$retVal = "Northern Cape, Upington";}
			if(9299 < intval($Pcode) && intval($Pcode)  < 9410){$retVal = "Free State, Bloemfontein 1";}
			if(9409 < intval($Pcode) && intval($Pcode)  < 9700){$retVal = "Free State, Welkom";}
			if(9699 < intval($Pcode)){$retVal = "Free State, Bloemfontein 2";}
			
			return $retVal;
		}

		if (isset($_POST["Pcode"])){
			if ($_POST["Pcode"] == ""){
				//Blank is not allowed redirect to the same page.
				header("Location: ./task9.php");			
				exit;
			}
			else{
				$CheckCode = $_POST["Pcode"];
				//This checks that the user entered a 4 character postal code.
				if (strlen($CheckCode) != 4){
					echo "$CheckCode is an invalid postal code it should be 4 digits long. <br><br>";
					echo '<form name="frmPostal" action="task9.php" method="POST">';		
					echo 'South African postal code: <input type="text" name="Pcode" value="'. $CheckCode .'"> ';
					echo '<input type="submit" value="Validate"> <br><br>';
					echo '<a href="http://mapserver2.statssa.gov.za/geographywebsite/Docs/AfricaGIS/679_South%20African%20Post%20Code%20Geography.pdf">
						  South African Postal code information</a>';
					echo '</form>';
				}
				else{
					//Valid is 1 to 8999 and 9300 to 9999
					//Preg_match is used with a regex to check that the postal code is valid.
					if (preg_match('/0[0-9][0-9][1-9]|1[0-9][0-9][0-9]|2[0-9][0-9][0-9]|3[0-9][0-9][0-9]|4[0-9][0-9][0-9]|5[0-9][0-9][0-9]|6[0-9][0-9][0-9]|7[0-9][0-9][0-9]|8[0-9][0-9][0-9]|9[3-9][0-9][0-9]/',$CheckCode)){
						echo "$CheckCode is an valid postal code for ". GetProvince($CheckCode) .". <br><br>";
						echo '<form name="frmPostal" action="task9.php" method="POST">';		
						echo 'South African postal code: <input type="text" name="Pcode"> ';
						echo '<input type="submit" value="Validate"> <br><br>';
						echo '<a href="http://mapserver2.statssa.gov.za/geographywebsite/Docs/AfricaGIS/679_South%20African%20Post%20Code%20Geography.pdf">
							  South African Postal code information</a>';
						echo '</form>';
					}else{
						echo "$CheckCode is an invalid postal code it should be between 1 and 8999 and between 9300 to 9999. <br><br>";
						echo '<form name="frmPostal" action="task9.php" method="POST">';		
						echo 'South African postal code: <input type="text" name="Pcode" value="'. $CheckCode .'"> ';
						echo '<input type="submit" value="Validate"> <br><br>';
						echo '<a href="http://mapserver2.statssa.gov.za/geographywebsite/Docs/AfricaGIS/679_South%20African%20Post%20Code%20Geography.pdf">
							  South African Postal code information</a>';
						echo '</form>';
					}
				}			
			}
		}
		else{
			echo '<form name="frmPostal" action="task9.php" method="POST">';		
			echo 'South African postal code: <input type="text" name="Pcode"> ';
			echo '<input type="submit" value="Validate"> <br><br>';
			echo '<a href="http://mapserver2.statssa.gov.za/geographywebsite/Docs/AfricaGIS/679_South%20African%20Post%20Code%20Geography.pdf">
				  South African Postal code information</a>';
			echo '</form>';
		}