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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:  13
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        DO_FCALL                                      0  $0      
         4        SEND_VAR                                                 $0
         5        DO_ICALL                                                 
   7     6        INIT_FCALL                                               'var_dump'
         7        INIT_FCALL                                               'foo'
         8        SEND_ARRAY                                               <array>
         9        DO_FCALL                                      0  $2      
        10        SEND_VAR                                                 $2
        11        DO_ICALL                                                 
        12      > 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 7.4.0