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<?php $arr = [ 0 => [ "name" => "A1", "project" => [ 0 => "New Project", ], ], 1 => [ "name" => "A2", "project" => [ 0 => "New Project", 2 => "Project", ], ], ]; array_walk($arr, function (&$val) { $val['project'] = implode(",", $val['project']); }); print_r($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LXn3L
function name:  (null)
number of ops:  10
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
   17     1        INIT_FCALL                                               'array_walk'
          2        SEND_REF                                                 !0
          3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FLXn3L%3A17%240'
   19     4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
   20     6        INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FLXn3L%3A17%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LXn3L
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $val
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   17     0  E >   RECV                                             !0      
   18     1        INIT_FCALL                                               'implode'
          2        SEND_VAL                                                 '%2C'
          3        FETCH_DIM_R                                      ~2      !0, 'project'
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                         $3      
          6        ASSIGN_DIM                                               !0, 'project'
          7        OP_DATA                                                  $3
   19     8      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FLXn3L%3A17%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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