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<?php $users = [ ['accounts' => [1, 2]], ['accounts' => [3, 4]], ]; $userAccounts = array_column($users, 'accounts'); $allAccounts = array_merge(...$userAccounts); var_dump($allAccounts);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/NmATQ
function name:  (null)
number of ops:  15
compiled vars:  !0 = $users, !1 = $userAccounts, !2 = $allAccounts
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    8     1        INIT_FCALL                                               'array_column'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'accounts'
          4        DO_ICALL                                         $4      
          5        ASSIGN                                                   !1, $4
    9     6        INIT_FCALL                                               'array_merge'
          7        SEND_UNPACK                                              !1
          8        CHECK_UNDEF_ARGS                                         
          9        DO_ICALL                                         $6      
         10        ASSIGN                                                   !2, $6
   10    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !2
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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