Extracting dates from date range

Part of my answer was answered by dynamic: How to extract every Monday and every fortnightly Monday from a range of two dates in PHP?

I've added a foreach loop to print all the mondays in this example:

$start = strtotime('2016-09-05');
$end = strtotime('2016-09-30');

$mondays=array(); 
$tuesdays=array();  

while( $start <= $end  ) {

if ( date('N',$start)==1 )   
$mondays[]=$start;
$start += 86400;  

}  
foreach ($mondays as $item) {  
print date("D. Y-m-d", ($item)); 
print ("<br>");
}

and i get these results: enter image description here

But how do i add an else/if statements to display the tuesdays for example

if the date begins with $start = strtotime('2016-09-06');

I want it to show: enter image description here

Thanks.