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<?php $result = array_map(function($v) { return ['key' => trim($v)]; }, explode(',', 'first_group, second_group, third_group')); print_r($result);
based on f5IDk
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JNCeo
function name:  (null)
number of ops:  14
compiled vars:  !0 = $result
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'array_map'
         1        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FJNCeo0x7f94ee678286'
         2        SEND_VAL                                                 ~1
         3        INIT_FCALL                                               'explode'
         4        SEND_VAL                                                 '%2C'
         5        SEND_VAL                                                 'first_group%2C+second_group%2C+third_group'
         6        DO_ICALL                                         $2      
         7        SEND_VAR                                                 $2
         8        DO_ICALL                                         $3      
         9        ASSIGN                                                   !0, $3
   4    10        INIT_FCALL                                               'print_r'
        11        SEND_VAR                                                 !0
        12        DO_ICALL                                                 
        13      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FJNCeo0x7f94ee678286:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JNCeo
function name:  {closure}
number of ops:  7
compiled vars:  !0 = $v
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
         1        INIT_FCALL                                               'trim'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                         $1      
         4        INIT_ARRAY                                       ~2      $1, 'key'
         5      > RETURN                                                   ~2
         6*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FJNCeo0x7f94ee678286

Generated using Vulcan Logic Dumper, using php 7.4.0