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<?php $params = ['a' => 'b']; array_filter($params, function ($v, $k) { return substr($k, 0, 7) == 'filter_'; });
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GkoN1
function name:  (null)
number of ops:  7
compiled vars:  !0 = $params
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   3     1        INIT_FCALL                                               'array_filter'
         2        SEND_VAR                                                 !0
         3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FGkoN10x7f7793aa7083'
   5     4        SEND_VAL                                                 ~2
         5        DO_ICALL                                                 
         6      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FGkoN10x7f7793aa7083:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/GkoN1
function name:  {closure}
number of ops:  10
compiled vars:  !0 = $v, !1 = $k
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
         1        RECV                                             !1      
   4     2        INIT_FCALL                                               'substr'
         3        SEND_VAR                                                 !1
         4        SEND_VAL                                                 0
         5        SEND_VAL                                                 7
         6        DO_ICALL                                         $2      
         7        IS_EQUAL                                         ~3      $2, 'filter_'
         8      > RETURN                                                   ~3
   5     9*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FGkoN10x7f7793aa7083

Generated using Vulcan Logic Dumper, using php 7.3.0