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<?php $array = [ [ "route_id" => 1539871200, "booking_id" => 171, "route" => "Boattrip Destination 2", "date" => "18 October 2018", "time" => "14:00 - 16:00" ], [ "route_id" => 1539856800, "booking_id" => 170, "route" => "Boattrip Destination 2", "date" => "18 October 2018", "time" => "10:00 - 12:00" ], [ "route_id" => 1539856800, "booking_id" => 162, "route" => "Boattrip Destination 2", "date" => "18 October 2018", "time" => "10:00 - 12:00" ] ]; foreach ($array as $set) { if (isset($result[$set["route_id"]])) { $result[$set["route_id"]]["booking_ids"][] = $set["booking_id"]; } else { $result[$set["route_id"]] = [ "route" => $set["route_id"], "date" => $set["date"], "time" => $set["time"], "booking_ids" => [$set["booking_id"]] ]; } } ksort($result); // ... you did say you wanted to sort them by route_id var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 26
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 26
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 13
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 25
Branch analysis from position: 25
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 13
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 26
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 26
filename:       /in/rjinc
function name:  (null)
number of ops:  34
compiled vars:  !0 = $array, !1 = $set, !2 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
   26     1      > FE_RESET_R                                       $4      !0, ->26
          2    > > FE_FETCH_R                                               $4, !1, ->26
   27     3    >   FETCH_DIM_R                                      ~5      !1, 'route_id'
          4        ISSET_ISEMPTY_DIM_OBJ                         0          !2, ~5
          5      > JMPZ                                                     ~6, ->13
   28     6    >   FETCH_DIM_R                                      ~7      !1, 'route_id'
          7        FETCH_DIM_R                                      ~11     !1, 'booking_id'
          8        FETCH_DIM_W                                      $8      !2, ~7
          9        FETCH_DIM_W                                      $9      $8, 'booking_ids'
         10        ASSIGN_DIM                                               $9
         11        OP_DATA                                                  ~11
         12      > JMP                                                      ->25
   30    13    >   FETCH_DIM_R                                      ~12     !1, 'route_id'
   31    14        FETCH_DIM_R                                      ~14     !1, 'route_id'
         15        INIT_ARRAY                                       ~15     ~14, 'route'
   32    16        FETCH_DIM_R                                      ~16     !1, 'date'
         17        ADD_ARRAY_ELEMENT                                ~15     ~16, 'date'
   33    18        FETCH_DIM_R                                      ~17     !1, 'time'
         19        ADD_ARRAY_ELEMENT                                ~15     ~17, 'time'
   34    20        FETCH_DIM_R                                      ~18     !1, 'booking_id'
         21        INIT_ARRAY                                       ~19     ~18
         22        ADD_ARRAY_ELEMENT                                ~15     ~19, 'booking_ids'
   30    23        ASSIGN_DIM                                               !2, ~12
   34    24        OP_DATA                                                  ~15
   26    25    > > JMP                                                      ->2
         26    >   FE_FREE                                                  $4
   38    27        INIT_FCALL                                               'ksort'
         28        SEND_REF                                                 !2
         29        DO_ICALL                                                 
   39    30        INIT_FCALL                                               'var_export'
         31        SEND_VAR                                                 !2
         32        DO_ICALL                                                 
         33      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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