get the number of weekends between two dates

imagene that u have two dates, example:

$inicio ="2008-10-10";
$fim ="2008-10-16";


I need a function that when I insert the two dates, the funcions returns the number of weekends that exist between the two date, I would be very greatfull for the help , tks

 

Just a tip if I may:
1 - Transform both dates into Unix timestamps (difference in seconds from January, 1st of 1970), like this:

  
$difinicio=strtotime($inicio.' 00:00:00');
$diffim=strtotime($fim.' 00:00:00');

PHP:

2 - check if $difinicio is a Sunday. If it is, add one to $weekcounter (counting sundays is the same as counting weekends). A Sunday is when date("w", $difinicio) == 0

if (date("w", $difinicio) == 0)
{
  $weekcounter++; 
}

PHP:

3 - Add one day to $difinicio like this:

$difinicio=  strtotime('+1 day',strtotime(date("Y",$difinicio).'-'.date("m",$difinicio).'-'.date("d",$difinicio).' 00:00:00'));

PHP:

4 - Repeat step 2 and 3 until $difinicio = $diffim

5 - $weekcounter should be your result.

This should work and I hope this helps.
You're a portuguese right? boa sorte then!

 

thank u so much, u dont know how much u helped me, ya Im portuguese.