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<?php $replace="Yuqi Building Contractor& Trading Pte Ltd"; echo preg_replace("/(?<!\s)&|&(?!\s)/", '', $replace); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WMCA5
function name:  (null)
number of ops:  8
compiled vars:  !0 = $replace
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'Yuqi+Building+Contractor%26+Trading+Pte+Ltd'
    3     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28%3F%3C%21%5Cs%29%26%7C%26%28%3F%21%5Cs%29%2F'
          3        SEND_VAL                                                 ''
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
    6     7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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