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

Generated using Vulcan Logic Dumper, using php 7.1.0