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

Generated using Vulcan Logic Dumper, using php 8.0.0


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