Validating South African ID

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C#3.5

How can i validate that the number inserted in a textbox is a valid south african id and if its a male or female

Posted 13-Oct-11 10:17am

Sibongiseni Khumalo

Updated 26-Mar-18 23:21pm

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E.F. Nijboer · Answer 1 · 2011-10-13T10:27:00

Solution 1

Have a look here (c# code can be found at the bottom of the page):
http://geekswithblogs.net/willemf/archive/2005/10/30/58561.aspx[^]

Good luck!

Posted 13-Oct-11 10:27am

E.F. Nijboer

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Monjurul Habib 13-Oct-11 17:06pm

nice link 5+

Monjurul Habib · Answer 2 · 2011-10-13T11:05:00

The format of a normal South-African ID number is as follows
{YYMMDD}{G}{SSS}{C}{A}{Z}
YYMMDD: Date of birth
G : Gender. 0-4 Female; 5-9 Male.
SSS : Sequence No. for DOB/G combination.
C : Citizenship. 0 SA; 1 Other.
A : Usually 8, or 9 (can be other values)
Z : Control digit.
The following logic explains how the control digit works:

For this explanation I am going to use ID number 860506 5 397 08 3
a) Add all the digits of the ID number in the odd positions (except for the last number, which is the control digit):
8+0+0+5+9+0 = 22
b) Take all the even digits as one number and multiply that by 2:
656378 * 2 = 1312756
c) Add the digits of this number together (in b)
1+3+1+2+7+5+6 = 25
d) Add the answer of C to the answer of A
22+25 = 47
e) Subtract the second character from D from 10, this number should now equal the control character
10-7 = 3 = control character (3)

and thus, if you ever have to validate an ID number this would be the best way to do it ...

Following are more links:
What is a South African ID number made up of?
{Resloved} ID number gender checking

Member 13746875 · Answer 3 · 2018-03-26T23:23:00

FULL HTML AND PHP CODE WITH EXTRAS

<html>
<body>

	<form method="post" action="<?=$_SERVER['PHP_SELF'];?>">
		<p>Enter the ID Number: <input name="idnumber" type="text" id="idnumber" /> </p>
		<p> <input type="submit" value="Check" /> </p>
	</form>

</body>
</html>
<?php


	Validate($_POST['idnumber']);
	function Validate($idNumber) {
		$correct = true;
		if (strlen($idNumber) !== 13 || !is_numeric($idNumber) ) {
			echo "ID number does not appear to be authentic - input not a valid number";
			$correct = false; die();
		}

		$year = substr($idNumber, 0,2);
		$currentYear = date("Y") % 100;
		$prefix = "19";
		if ($year < $currentYear)
		    $prefix = "20";
	    $id_year = $prefix.$year;

        $id_month = substr($idNumber, 2,2);
        $id_date = substr($idNumber, 4,2);

		$fullDate = $id_date. "-" . $id_month. "-" . $id_year;
		
		if (!$id_year == substr($idNumber, 0,2) && $id_month == substr($idNumber, 2,2) && $id_date == substr($idNumber, 4,2)) {
			echo 'ID number does not appear to be authentic - date part not valid'; 
			$correct = false;
		}
		$genderCode = substr($idNumber, 6,4);
        $gender = (int)$genderCode < 5000 ? "Female" : "Male";

       $citzenship = (int)substr($idNumber, 10,1)  === 0 ? "citizen" : "resident";//0 for South African citizen, 1 for a permanent resident

        $total = 0;
        $count = 0;
	    for ($i = 0;$i < strlen($idNumber);++$i)
	    {
		    $multiplier = $count % 2 + 1;
		    $count ++;
		    $temp = $multiplier * (int)$idNumber{$i};
		    $temp = floor($temp / 10) + ($temp % 10);
		    $total += $temp;
	    }
	    $total = ($total * 9) % 10;

	    if ($total % 10 != 0) {
	        echo 'ID number does not appear to be authentic - check digit is not valid';
		    $correct = false;
	    }

        if ($correct){
            echo nl2br( "\nSouth African ID Number:   ". $idNumber .
                '  Birth Date:   ' . $fullDate.
                '  Gender:  ' . $gender .
                '  SA Citizen:  ' . $citzenship);
        }
	}

Validating South African ID

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