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<?php $fio = 'YusifovaVusaleЮзифоваВусаля'; print_r( preg_split('~(?!^)(?=\p{Lu})~u', $fio) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fI39N
function name:  (null)
number of ops:  9
compiled vars:  !0 = $fio
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'YusifovaVusale%D0%AE%D0%B7%D0%B8%D1%84%D0%BE%D0%B2%D0%B0%D0%92%D1%83%D1%81%D0%B0%D0%BB%D1%8F'
    4     1        INIT_FCALL                                                   'print_r'
          2        INIT_FCALL                                                   'preg_split'
          3        SEND_VAL                                                     '%7E%28%3F%21%5E%29%28%3F%3D%5Cp%7BLu%7D%29%7Eu'
          4        SEND_VAR                                                     !0
          5        DO_ICALL                                             $2      
          6        SEND_VAR                                                     $2
          7        DO_ICALL                                                     
          8      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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