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<?php $replacement = "1"; $final = substr($string, 0, 1).$replacement; echo $final;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MpumJ
function name:  (null)
number of ops:  10
compiled vars:  !0 = $replacement, !1 = $final, !2 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '1'
    4     1        INIT_FCALL                                               'substr'
          2        SEND_VAR                                                 !2
          3        SEND_VAL                                                 0
          4        SEND_VAL                                                 1
          5        DO_ICALL                                         $4      
          6        CONCAT                                           ~5      $4, !0
          7        ASSIGN                                                   !1, ~5
    5     8        ECHO                                                     !1
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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