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<?php $arrStart = [ 0 => [ "start" => "04/26/2015 8:00 AM", ], 1 => [ "start" => "04/26/2015 9:00 AM", ], ]; $arrEnd = [ 0 => [ "end" => "04/26/2015 10:00 AM", ], 1 => [ "end" => "04/26/2015 11:00 AM", ], ]; $keys = [ 0 => "1", 1 => "3", ]; $result = []; foreach ($keys as $i => $key) { $result[$key] = [ 'start' => $arrStart[$i][0], 'end' => $arrEnd[$i][0], ]; } var_dump($result);
based on mfZ1s
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 5, Position 2 = 16
Branch analysis from position: 5
Jump found. Position 1 = 6, Position 2 = 16
Branch analysis from position: 6
Jump found. Position 1 = 5
Branch analysis from position: 5
Branch analysis from position: 16
Jump found. Position 1 = -2
Branch analysis from position: 16
filename:       /in/GoWiV
function name:  (null)
number of ops:  21
compiled vars:  !0 = $arrStart, !1 = $arrEnd, !2 = $keys, !3 = $result, !4 = $key, !5 = $i
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   6     0  E >   ASSIGN                                                   !0, <array>
  15     1        ASSIGN                                                   !1, <array>
  22     2        ASSIGN                                                   !2, <array>
  26     3        ASSIGN                                                   !3, <array>
  28     4      > FE_RESET_R                                       $10     !2, ->16
         5    > > FE_FETCH_R                                               $10, !4, ->16
         6    >   ASSIGN                                                   !5, ~11
  30     7        FETCH_DIM_R                                      $14     !0, !5
         8        FETCH_DIM_R                                      $15     $14, 0
         9        INIT_ARRAY                                       ~16     $15, 'start'
  31    10        FETCH_DIM_R                                      $17     !1, !5
        11        FETCH_DIM_R                                      $18     $17, 0
        12        ADD_ARRAY_ELEMENT                                ~16     $18, 'end'
  29    13        ASSIGN_DIM                                               !3, !4
  31    14        OP_DATA                                                  ~16
        15      > JMP                                                      ->5
        16    >   FE_FREE                                                  $10
  35    17        INIT_FCALL                                               'var_dump'
        18        SEND_VAR                                                 !3
        19        DO_ICALL                                                 
        20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0