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<?php $test = "aaaa\n"; var_dump(preg_match("/a+$/", $test)); var_dump(preg_match("/a+$/D", $test));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/33Gks
function name:  (null)
number of ops:  10
compiled vars:  !0 = $test
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'aaaa%0A'
    4     1        INIT_FCALL                                                   'var_dump'
          2        FRAMELESS_ICALL_2                preg_match          ~2      '%2Fa%2B%24%2F', !0
          3        SEND_VAL                                                     ~2
          4        DO_ICALL                                                     
    5     5        INIT_FCALL                                                   'var_dump'
          6        FRAMELESS_ICALL_2                preg_match          ~4      '%2Fa%2B%24%2FD', !0
          7        SEND_VAL                                                     ~4
          8        DO_ICALL                                                     
          9      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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