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<?php $fields = [ "hello", "new\nold", "world"]; print_r( str_replace("\n", '|', $fields) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/v3Tip
function name:  (null)
number of ops:  7
compiled vars:  !0 = $fields
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
    4     1        INIT_FCALL                                                   'print_r'
    5     2        FRAMELESS_ICALL_3                str_replace         ~2      '%0A', '%7C'
          3        OP_DATA                                                      !0
          4        SEND_VAL                                                     ~2
    4     5        DO_ICALL                                                     
    6     6      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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