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<?php $a = 1/5*100; $a = (string)$a.'%'; echo $a;
based on ldnjj
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/4aUeZ
function name:  (null)
number of ops:  6
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, 20
   3     1        CAST                                          6  ~2      !0
         2        CONCAT                                           ~3      ~2, '%25'
         3        ASSIGN                                                   !0, ~3
   4     4        ECHO                                                     !0
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0