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<?php echo (is_a(NULL, Exception)) ? 'yes' : 'no';
based on hCDhQ
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 6, Position 2 = 8
Branch analysis from position: 6
Jump found. Position 1 = 9
Branch analysis from position: 9
Jump found. Position 1 = -2
Branch analysis from position: 8
Jump found. Position 1 = -2
filename:       /in/6JQHC
function name:  (null)
number of ops:  11
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'is_a'
         1        SEND_VAL                                                 null
         2        FETCH_CONSTANT                                   ~0      'Exception'
         3        SEND_VAL                                                 ~0
         4        DO_ICALL                                         $1      
         5      > JMPZ                                                     $1, ->8
         6    >   QM_ASSIGN                                        ~2      'yes'
         7      > JMP                                                      ->9
         8    >   QM_ASSIGN                                        ~2      'no'
         9    >   ECHO                                                     ~2
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0