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<?php $a = 13; $b = 12; $c = $a << $b; var_dump($c);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/N47HL
function name:  (null)
number of ops:  8
compiled vars:  !0 = $a, !1 = $b, !2 = $c
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 13
   4     1        ASSIGN                                                   !1, 12
   5     2        SL                                               ~5      !0, !1
         3        ASSIGN                                                   !2, ~5
   6     4        INIT_FCALL                                               'var_dump'
         5        SEND_VAR                                                 !2
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0