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<?php $test = array('key' => 'value'); print_r( array_reduce( array_keys( array_filter( $test, function($key,$value){ return $value == 'value';}, ARRAY_FILTER_USE_BOTH ) ), function($carry,$value){return $carry . $value;} ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SiYam
function name:  (null)
number of ops:  19
compiled vars:  !0 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        INIT_FCALL                                               'print_r'
    6     2        INIT_FCALL                                               'array_reduce'
    7     3        INIT_FCALL                                               'array_keys'
    8     4        INIT_FCALL                                               'array_filter'
    9     5        SEND_VAR                                                 !0
   10     6        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FSiYam%3A10%240'
          7        SEND_VAL                                                 ~2
   11     8        SEND_VAL                                                 1
          9        DO_ICALL                                         $3      
         10        SEND_VAR                                                 $3
         11        DO_ICALL                                         $4      
         12        SEND_VAR                                                 $4
   14    13        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FSiYam%3A14%241'
         14        SEND_VAL                                                 ~5
         15        DO_ICALL                                         $6      
         16        SEND_VAR                                                 $6
         17        DO_ICALL                                                 
   16    18      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FSiYam%3A10%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SiYam
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $key, !1 = $value
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   10     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        IS_EQUAL                                         ~2      !1, 'value'
          3      > RETURN                                                   ~2
          4*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FSiYam%3A10%240

Function %00%7Bclosure%7D%2Fin%2FSiYam%3A14%241:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SiYam
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $carry, !1 = $value
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   14     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        CONCAT                                           ~2      !0, !1
          3      > RETURN                                                   ~2
          4*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FSiYam%3A14%241

Generated using Vulcan Logic Dumper, using php 8.0.0


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