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<?php $v = 'var'; echo " xx {$v}"; echo " xx ${v}";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5u8FA
function name:  (null)
number of ops:  8
compiled vars:  !0 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'var'
    3     1        NOP                                                      
          2        FAST_CONCAT                                      ~2      '+xx+', !0
          3        ECHO                                                     ~2
    4     4        NOP                                                      
          5        FAST_CONCAT                                      ~3      '+xx+', !0
          6        ECHO                                                     ~3
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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