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<?php $str = "\xC2\xA1Hola!"; preg_match('/H/u', $str, $a_matches, PREG_OFFSET_CAPTURE); echo $str, mb_strlen(substr($str, 0, $a_matches[0][1]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iHl4a
function name:  (null)
number of ops:  20
compiled vars:  !0 = $str, !1 = $a_matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%C2%A1Hola%21'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2FH%2Fu'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        SEND_VAL                                                 256
          6        DO_ICALL                                                 
    5     7        ECHO                                                     !0
          8        INIT_FCALL                                               'mb_strlen'
          9        INIT_FCALL                                               'substr'
         10        SEND_VAR                                                 !0
         11        SEND_VAL                                                 0
         12        FETCH_DIM_R                                      ~4      !1, 0
         13        FETCH_DIM_R                                      ~5      ~4, 1
         14        SEND_VAL                                                 ~5
         15        DO_ICALL                                         $6      
         16        SEND_VAR                                                 $6
         17        DO_ICALL                                         $7      
         18        ECHO                                                     $7
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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