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<?php $str = "\xFC\x80\x80\x80\x80\x80"; preg_match_all( '/./u' , $str , $matches , PREG_SET_ORDER ); print_r($matches); exit(0);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 79) Position 1 = -2
filename:       /in/9hOhT
function name:  (null)
number of ops:  12
compiled vars:  !0 = $str, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%FC%80%80%80%80%80'
    5     1        INIT_FCALL                                               'preg_match_all'
          2        SEND_VAL                                                 '%2F.%2Fu'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        SEND_VAL                                                 2
          6        DO_ICALL                                                 
    7     7        INIT_FCALL                                               'print_r'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
    9    10      > EXIT                                                     0
         11*     > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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