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<?php $date = new \DateTime; $className = "\\DateTime"; var_dump($date instanceof $classname);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/NPIsH
function name:  (null)
number of ops:  10
compiled vars:  !0 = $date, !1 = $className, !2 = $classname
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $3      'DateTime'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $3
    4     3        ASSIGN                                                   !1, '%5CDateTime'
    6     4        INIT_FCALL                                               'var_dump'
          5        FETCH_CLASS                                   0  $7      !2
          6        INSTANCEOF                                       ~8      !0, $7
          7        SEND_VAL                                                 ~8
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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