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<?php var_dump(strpos('мебель', 'покупайте мебель в Перми'));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/T21Ld
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'strpos'
         2        SEND_VAL                                                 '%D0%BC%D0%B5%D0%B1%D0%B5%D0%BB%D1%8C'
         3        SEND_VAL                                                 '%D0%BF%D0%BE%D0%BA%D1%83%D0%BF%D0%B0%D0%B9%D1%82%D0%B5+%D0%BC%D0%B5%D0%B1%D0%B5%D0%BB%D1%8C+%D0%B2+%D0%9F%D0%B5%D1%80%D0%BC%D0%B8'
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0