Strings

[Pompiuses]

I recive a string in a form like this: 200065123-19
If you add all the numbers before the dash together, the sum shall be the same as the number after the dash. Like this: 2+0+0+0+6+5+1+2+3 = 19

How can I check this?

[LordShryku]

[man]explode[/man] on - to get an array of numbers and total.
[man]str_split[/man](there's an alternate function for this in user comments, since it's PHP 5 only) on the numbers in the first part of your split array.
[man]array_sum[/man] the split numbers, compare to the orignal total.

[AstroTeg]

Instead of str_split you could do a few things:

$aBits = array();
for($a = 0; $a < strlen($string); $a++)
  $aBits[] = $string{$a};

That I think will do what str_split() would do.

Or if you just want to loop once on the string:

$total = 0;
for($a = 0; $a < strlen($string); $a++)
  $total += $string{$a};
// $total now has the string total

These are untested, but in theory should work. Both chunks of code assume the string is just a list of numbers and has the '-' and total value removed from the end.