在while循环的最后一次迭代中保留变量

Question

I am stuck at a situation in my code. A variable $end_date is iterating in a while loop for showing end date of five chapters. Now on the basis of this variable I have to show an alert box. My problem is when the last chapter's end date is found the alert box pops up which is not valid because for other four chapters the end date is extended. How can I leave end date for the last chapter only and alert box condition should not be matched. I have tried alot on this but can't make a logic for this. Help or advice will be appreciated.

  if((strtotime($today_date) >= strtotime($end_date) || ( $pass_count == 0 && $status_request != 2 && $status_request != 0 ) ) )
  {


 echo ("<SCRIPT LANGUAGE='JavaScript'>
       mess1='Your exam validity date has been expired. Click OK to request for extending your Quiz validity or you can ignore by clicking Cancel.'  

       x = confirm(mess1);
       if (x == true)  
   {
       window.location = 'validity_request_mail.php?userid=$userid ';    

   } 

       </SCRIPT>");

 }

Answer 1

Solution

We may introduce a new variable named $last_date which is for capturing the "greatest" end date of all chapters.

It seems that the problem is that after a while() loop, the $end_date is set, and it should be the last date. However the last (5th iteration) has an $end_date before other $end_date (s) of other chapters, so showing the confirm() box is not correct (since there are some chapters that are not expired yet).

So this should fix it:

while (...) { 
    ... 
} 
... 
// snippet in OP's post

To:

$last_date = '';
while (...) { 
    ... 
    if ( strtotime($end_date) > strtotime($last_date) ) { 
        $last_date = $end_date; 
    } 
} 
... 
$end_date = $last_date; // continue with snippet in OP's post