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<?php $someEmoji = "([\x{1F602}-\x{1F64F}]+)xu"; $result = preg_match($someEmoji, "foo \u{1F602}", $matches, PREG_OFFSET_CAPTURE); var_dump($matches); $someEmoji = "([\u{1F602}-\u{1F64F}]+)xu"; $result = preg_match($someEmoji, "foo \u{1F602}", $matches, PREG_OFFSET_CAPTURE); var_dump($matches); // codepoints in php $someEmoji = "([\u{1F602}-\u{1F64F}]+)xu"; $result = preg_match($someEmoji, "foo \u{1F602}", $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/nI4B6
function name:  (null)
number of ops:  34
compiled vars:  !0 = $someEmoji, !1 = $result, !2 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%28%5B%5Cx%7B1F602%7D-%5Cx%7B1F64F%7D%5D%2B%29xu'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'foo+%F0%9F%98%82'
          4        SEND_REF                                                 !2
          5        SEND_VAL                                                 256
          6        DO_ICALL                                         $4      
          7        ASSIGN                                                   !1, $4
    5     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !2
         10        DO_ICALL                                                 
    8    11        ASSIGN                                                   !0, '%28%5B%F0%9F%98%82-%F0%9F%99%8F%5D%2B%29xu'
    9    12        INIT_FCALL                                               'preg_match'
         13        SEND_VAR                                                 !0
         14        SEND_VAL                                                 'foo+%F0%9F%98%82'
         15        SEND_REF                                                 !2
         16        SEND_VAL                                                 256
         17        DO_ICALL                                         $8      
         18        ASSIGN                                                   !1, $8
   10    19        INIT_FCALL                                               'var_dump'
         20        SEND_VAR                                                 !2
         21        DO_ICALL                                                 
   14    22        ASSIGN                                                   !0, '%28%5B%F0%9F%98%82-%F0%9F%99%8F%5D%2B%29xu'
   15    23        INIT_FCALL                                               'preg_match'
         24        SEND_VAR                                                 !0
         25        SEND_VAL                                                 'foo+%F0%9F%98%82'
         26        SEND_REF                                                 !2
         27        SEND_VAL                                                 256
         28        DO_ICALL                                         $12     
         29        ASSIGN                                                   !1, $12
   16    30        INIT_FCALL                                               'var_dump'
         31        SEND_VAR                                                 !2
         32        DO_ICALL                                                 
         33      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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