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<?php $a = 'Павел Дуров'; mb_strtolower($a); print_r(preg_quote($a));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/X6XQ2
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%D0%9F%D0%B0%D0%B2%D0%B5%D0%BB+%D0%94%D1%83%D1%80%D0%BE%D0%B2'
    5     1        INIT_FCALL                                               'mb_strtolower'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    7     4        INIT_FCALL                                               'print_r'
          5        INIT_FCALL                                               'preg_quote'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                         $3      
          8        SEND_VAR                                                 $3
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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