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<?php echo null; $var = null; echo $var; echo is_null($var); ?>
based on SQGDP
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/KhEHg
function name:  (null)
number of ops:  6
compiled vars:  !0 = $var
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ECHO                                                     null
   5     1        ASSIGN                                                   !0, null
   7     2        ECHO                                                     !0
   9     3        TYPE_CHECK                                    1  ~2      !0
         4        ECHO                                                     ~2
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0