creating a loop for time incremented by 15 minutes in php

while loop

 $CI =& get_instance();

                    $CI->load->model('shop_model');

                    // echo $shop_id;

                    $shop_details_new = $CI->shop_model->get_shop_timing($shop_id);  

                    

                  

                    $start_time_new = $shop_details_new->start_time;

                    $end_time_new = $shop_details_new->end_time;

                    $start_time_new=str_replace(' ','',$start_time_new);

                    $end_time_new=str_replace(' ','',$end_time_new);

                    

                    $start=strtotime($start_time_new);

                    $end=strtotime($end_time_new);

                 

                    if ($start <$end) {

                      while ($start < $end){

                        echo date('g:i A',$start).'<br>';

                        $start = $start + 15*60;

                      }

                    }

for loop

<?php $CI =& get_instance(); $CI->load->model('shop_model'); // echo $shop_id; $shop_details_new = $CI->shop_model->get_shop_timing($shop_id); $start_time_new = $shop_details_new->start_time; $end_time_new = $shop_details_new->end_time; $start_time_new=str_replace(' ','',$start_time_new); $end_time_new=str_replace(' ','',$end_time_new); $start=strtotime($start_time_new); $end=strtotime($end_time_new); for ($i=$start;$i<=$end;$i = $i + 15*60) { //write your if conditions and implement your logic here echo date('g:i A',$i).'<br>'; } ?>