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<?php $search = 'The'; $replace = 'A'; $subject = "The Quick Brown Fox Jumps Over The Lazy Dog's Thermos!"; echo preg_replace( '/.*\K\b' . preg_quote($search, '/') . '\b/i', $replace, $subject );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/P5dCb
function name:  (null)
number of ops:  16
compiled vars:  !0 = $search, !1 = $replace, !2 = $subject
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'The'
    4     1        ASSIGN                                                   !1, 'A'
    5     2        ASSIGN                                                   !2, 'The+Quick+Brown+Fox+Jumps+Over+The+Lazy+Dog%27s+Thermos%21'
    7     3        INIT_FCALL                                               'preg_replace'
    8     4        INIT_FCALL                                               'preg_quote'
          5        SEND_VAR                                                 !0
          6        SEND_VAL                                                 '%2F'
          7        DO_ICALL                                         $6      
          8        CONCAT                                           ~7      '%2F.%2A%5CK%5Cb', $6
          9        CONCAT                                           ~8      ~7, '%5Cb%2Fi'
         10        SEND_VAL                                                 ~8
    9    11        SEND_VAR                                                 !1
   10    12        SEND_VAR                                                 !2
         13        DO_ICALL                                         $9      
         14        ECHO                                                     $9
   11    15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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