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<?php function foo($b, $a) { return $b . $a; } var_dump(call_user_func_array('foo', ['a' => 'first', 'b' => 'second'])); var_dump(call_user_func_array('foo', ['first', 'second']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dnodm
function name:  (null)
number of ops:  15
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                                   'var_dump'
          1        INIT_FCALL                                                   'foo'
          2        SEND_ARRAY                                                   <array>
          3        CHECK_UNDEF_ARGS                                             
          4        DO_FCALL                                          1  $0      
          5        SEND_VAR                                                     $0
          6        DO_ICALL                                                     
    7     7        INIT_FCALL                                                   'var_dump'
          8        INIT_FCALL                                                   'foo'
          9        SEND_ARRAY                                                   <array>
         10        CHECK_UNDEF_ARGS                                             
         11        DO_FCALL                                          1  $2      
         12        SEND_VAR                                                     $2
         13        DO_ICALL                                                     
         14      > RETURN                                                       1

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

End of function foo

Generated using Vulcan Logic Dumper, using php 8.5.0


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