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<?php $s = "57841 Johns ave tyson, md 20879"; echo preg_replace('~(\d)~', '${1} ', $s);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/52gR8
function name:  (null)
number of ops:  8
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '57841+Johns+ave+tyson%2C+md+20879'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%28%5Cd%29%7E'
          3        SEND_VAL                                                 '%24%7B1%7D+'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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