REGON

7 digit REGON

First six digits have weights:
weights:  2  3  4  5  6  7
digits:  d1 d2 d3 d4 d5 d6
Here is algorithm for finding d7:
sum = 2*d1+3*d2+4*d3+5*d4+6*d5+7*d6
d7 = sum mod 11

9 digit REGON

First eight digits have weights:
weights:  8  9  2  3  4  5  6  7 
digits:  d1 d2 d3 d4 d5 d6 d7 d8
Here is algorithm for finding d9:
sum = 8*d1+9*d2+2*d3+3*d4+4*d5+5*d6+6*d7+7*d8
d9 = sum mod 11



Enter REGON code (only digits):


PHP code: 
$number = strlen($reg);
if(!(($number==9)||($number==7))) {
   print "Incorrect REGON!<BR>";
   return 1;
}
if(==7) {
   for($i = 0; $i<7;  $i++)
   { 
      if(!($reg[$i]>='0' && $reg[$i]<='9')) {
	       print "Incorrect REGON7! (DIGIT)<BR>"
		   return 1;
	     }
	     $arr[$i] = $reg[$i]-'0';
	}
  $sum = $arr[0]*2+$arr[1]*3+$arr[2]*4+$arr[3]*5+$arr[4]*6+$arr[5]*7;
	$sum %= 11;
	if($sum!=$arr[6]) {
	   print "Incorrect REGON7 (code)!<BR>";
	   return 1;
  }
  print "CORRECT!<BR>7 digit REGON code is: $reg<br>";
} else {
	for($i = 0; $i<9;  $i++)
	{
		if(!($reg[$i]>='0' && $reg[$i]<='9')) {
			print "Incorrect REGON9! (DIGIT)<BR>";
				return 1;
		}
	    $arr[$i] = $reg[$i]-'0';
	}
	$sum = $arr[0]*8+$arr[1]*9+$arr[2]*2+$arr[3]*3+$arr[4]*4+$arr[5]*5+$arr[6]*6+$arr[7]*7;
	$sum %= 11;
	if($sum!=$arr[8]) {
		print "Incorrect REGON9 (code)!<BR>";
		return 1;
	}
	print "CORRECT!<BR>9 digit REGON code is: $reg<br>";
}

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