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  1. <?php
  2.  
  3. // your code goes here
  4. $hours = array(6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23);
  5. $minutes = array('00','15','30','45');
  6.  
  7. $result_array = array();
  8.  
  9. foreach($hours as $h){
  10. foreach($minutes as $m){
  11. $val = str_pad($h,2,'0',STR_PAD_LEFT) . ':' . $m;
  12. $result_array[] = $val;
  13. }
  14. }
  15.  
  16. var_dump($result_array);
Success #stdin #stdout 0.04s 52480KB
stdin
Standard input is empty
stdout
array(72) {
  [0]=>
  string(5) "06:00"
  [1]=>
  string(5) "06:15"
  [2]=>
  string(5) "06:30"
  [3]=>
  string(5) "06:45"
  [4]=>
  string(5) "07:00"
  [5]=>
  string(5) "07:15"
  [6]=>
  string(5) "07:30"
  [7]=>
  string(5) "07:45"
  [8]=>
  string(5) "08:00"
  [9]=>
  string(5) "08:15"
  [10]=>
  string(5) "08:30"
  [11]=>
  string(5) "08:45"
  [12]=>
  string(5) "09:00"
  [13]=>
  string(5) "09:15"
  [14]=>
  string(5) "09:30"
  [15]=>
  string(5) "09:45"
  [16]=>
  string(5) "10:00"
  [17]=>
  string(5) "10:15"
  [18]=>
  string(5) "10:30"
  [19]=>
  string(5) "10:45"
  [20]=>
  string(5) "11:00"
  [21]=>
  string(5) "11:15"
  [22]=>
  string(5) "11:30"
  [23]=>
  string(5) "11:45"
  [24]=>
  string(5) "12:00"
  [25]=>
  string(5) "12:15"
  [26]=>
  string(5) "12:30"
  [27]=>
  string(5) "12:45"
  [28]=>
  string(5) "13:00"
  [29]=>
  string(5) "13:15"
  [30]=>
  string(5) "13:30"
  [31]=>
  string(5) "13:45"
  [32]=>
  string(5) "14:00"
  [33]=>
  string(5) "14:15"
  [34]=>
  string(5) "14:30"
  [35]=>
  string(5) "14:45"
  [36]=>
  string(5) "15:00"
  [37]=>
  string(5) "15:15"
  [38]=>
  string(5) "15:30"
  [39]=>
  string(5) "15:45"
  [40]=>
  string(5) "16:00"
  [41]=>
  string(5) "16:15"
  [42]=>
  string(5) "16:30"
  [43]=>
  string(5) "16:45"
  [44]=>
  string(5) "17:00"
  [45]=>
  string(5) "17:15"
  [46]=>
  string(5) "17:30"
  [47]=>
  string(5) "17:45"
  [48]=>
  string(5) "18:00"
  [49]=>
  string(5) "18:15"
  [50]=>
  string(5) "18:30"
  [51]=>
  string(5) "18:45"
  [52]=>
  string(5) "19:00"
  [53]=>
  string(5) "19:15"
  [54]=>
  string(5) "19:30"
  [55]=>
  string(5) "19:45"
  [56]=>
  string(5) "20:00"
  [57]=>
  string(5) "20:15"
  [58]=>
  string(5) "20:30"
  [59]=>
  string(5) "20:45"
  [60]=>
  string(5) "21:00"
  [61]=>
  string(5) "21:15"
  [62]=>
  string(5) "21:30"
  [63]=>
  string(5) "21:45"
  [64]=>
  string(5) "22:00"
  [65]=>
  string(5) "22:15"
  [66]=>
  string(5) "22:30"
  [67]=>
  string(5) "22:45"
  [68]=>
  string(5) "23:00"
  [69]=>
  string(5) "23:15"
  [70]=>
  string(5) "23:30"
  [71]=>
  string(5) "23:45"
}