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<?php function a($a, array $b = array()) { return !! $b; } var_dump(a(1, array(1))); var_dump(a(1));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LABPh
function name:  (null)
number of ops:  14
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'a'
          2        SEND_VAL                                                 1
          3        SEND_VAL                                                 <array>
          4        DO_FCALL                                      0  $0      
          5        SEND_VAR                                                 $0
          6        DO_ICALL                                                 
   10     7        INIT_FCALL                                               'var_dump'
          8        INIT_FCALL                                               'a'
          9        SEND_VAL                                                 1
         10        DO_FCALL                                      0  $2      
         11        SEND_VAR                                                 $2
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Function a:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LABPh
function name:  a
number of ops:  6
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
          1        RECV_INIT                                        !1      <array>
    6     2        BOOL_NOT                                         ~2      !1
          3        BOOL_NOT                                         ~3      ~2
          4      > RETURN                                                   ~3
    7     5*     > RETURN                                                   null

End of function a

Generated using Vulcan Logic Dumper, using php 8.0.0


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