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<?php $t=html_entity_decode("&#60b&#62vist&#60/b&#62"); echo $t; echo str_replace(array("<b>", "</b>"),"@",$t);
based on Y0PZ9
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/083Xu
function name:  (null)
number of ops:  12
compiled vars:  !0 = $t
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'html_entity_decode'
         1        SEND_VAL                                                 '%26%2360b%26%2362vist%26%2360%2Fb%26%2362'
         2        DO_ICALL                                         $1      
         3        ASSIGN                                                   !0, $1
   3     4        ECHO                                                     !0
   4     5        INIT_FCALL                                               'str_replace'
         6        SEND_VAL                                                 <array>
         7        SEND_VAL                                                 '%40'
         8        SEND_VAR                                                 !0
         9        DO_ICALL                                         $3      
        10        ECHO                                                     $3
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0