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<?php $hola = null; echo $hola??'no definido'; $hola = false; echo $hola??'no definido';
based on h7ZT9
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/8DkQo
function name:  (null)
number of ops:  9
compiled vars:  !0 = $hola
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, null
   5     1        COALESCE                                         ~2      !0
         2        QM_ASSIGN                                        ~2      'no+definido'
         3        ECHO                                                     ~2
   7     4        ASSIGN                                                   !0, <false>
   9     5        COALESCE                                         ~4      !0
         6        QM_ASSIGN                                        ~4      'no+definido'
         7        ECHO                                                     ~4
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0