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<?php $var1="[i]this is just a stest you jsfajz[/i]"; echo preg_replace("/\[i\](.*)\[\/i\]/i", "<i>\\1</i>", $var1); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oiZnB
function name:  (null)
number of ops:  8
compiled vars:  !0 = $var1
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%5Bi%5Dthis+is+just+a+stest+you+jsfajz%5B%2Fi%5D'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%5C%5Bi%5C%5D%28.%2A%29%5C%5B%5C%2Fi%5C%5D%2Fi'
          3        SEND_VAL                                                 '%3Ci%3E%5C1%3C%2Fi%3E'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
    5     7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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