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<?php $array = [ [ 'avgvalue' => 0, 'timestamp' => '2011-02-04T11:00:00.000Z', ], [ 'avgvalue' => 268.3, 'timestamp' => '2011-02-04T12:00:00.000Z' ], ]; $result = []; foreach ($array as $row) { $result[substr($row['timestamp'], 0, 10)][] = $row; } var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 11
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 11
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 11
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 11
filename:       /in/YbQQU
function name:  (null)
number of ops:  16
compiled vars:  !0 = $array, !1 = $result, !2 = $row
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
   14     1        ASSIGN                                                       !1, <array>
   15     2      > FE_RESET_R                                           $5      !0, ->11
          3    > > FE_FETCH_R                                                   $5, !2, ->11
   16     4    >   FETCH_DIM_R                                          ~6      !2, 'timestamp'
          5        FRAMELESS_ICALL_3                substr              ~7      ~6, 0
          6        OP_DATA                                                      10
          7        FETCH_DIM_W                                          $8      !1, ~7
          8        ASSIGN_DIM                                                   $8
          9        OP_DATA                                                      !2
   15    10      > JMP                                                          ->3
         11    >   FE_FREE                                                      $5
   18    12        INIT_FCALL                                                   'var_export'
         13        SEND_VAR                                                     !1
         14        DO_ICALL                                                     
         15      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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