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<?php $arr = [ ['email' => 'a'], ['email' => 'b'], ['email' => 'c'] ]; var_dump(array_reduce($arr, function($str, $item) { return '' === $str ? $item['email'] : $str.', ' . $item['email']; }), '');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LAc2b
function name:  (null)
number of ops:  11
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    9     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'array_reduce'
          3        SEND_VAR                                                 !0
          4        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FLAc2b%3A9%240'
          5        SEND_VAL                                                 ~2
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        SEND_VAL                                                 ''
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FLAc2b%3A9%240:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 7
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 11
Branch analysis from position: 11
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LAc2b
function name:  {closure}
number of ops:  13
compiled vars:  !0 = $str, !1 = $item
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
          0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        IS_IDENTICAL                                             !0, ''
          3      > JMPZ                                                     ~2, ->7
          4    >   FETCH_DIM_R                                      ~3      !1, 'email'
          5        QM_ASSIGN                                        ~4      ~3
          6      > JMP                                                      ->11
          7    >   CONCAT                                           ~5      !0, '%2C+'
          8        FETCH_DIM_R                                      ~6      !1, 'email'
          9        CONCAT                                           ~7      ~5, ~6
         10        QM_ASSIGN                                        ~4      ~7
         11    > > RETURN                                                   ~4
         12*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FLAc2b%3A9%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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