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<?php var_dump(preg_replace('/[bcsqrt|bcpow|round]/', '<$0>', 'durow') === preg_replace('/[bosdqrtcpwun|]/', '<$0>', 'durow2'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VpJNF
function name:  (null)
number of ops:  15
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%5Bbcsqrt%7Cbcpow%7Cround%5D%2F'
          3        SEND_VAL                                                 '%3C%240%3E'
          4        SEND_VAL                                                 'durow'
          5        DO_ICALL                                         $0      
          6        INIT_FCALL                                               'preg_replace'
          7        SEND_VAL                                                 '%2F%5Bbosdqrtcpwun%7C%5D%2F'
          8        SEND_VAL                                                 '%3C%240%3E'
          9        SEND_VAL                                                 'durow2'
         10        DO_ICALL                                         $1      
         11        IS_IDENTICAL                                     ~2      $0, $1
         12        SEND_VAL                                                 ~2
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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