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<?php $array = new ArrayObject(array('A','B')); var_dump(is_array($array));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Fs95J
function name:  (null)
number of ops:  9
compiled vars:  !0 = $array
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NEW                                              $1      :-5
         1        SEND_VAL_EX                                              <array>
         2        DO_FCALL                                      0          
         3        ASSIGN                                                   !0, $1
   5     4        INIT_FCALL                                               'var_dump'
         5        TYPE_CHECK                                    7  ~4      !0
         6        SEND_VAL                                                 ~4
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0