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<?php $mailBody = '<title>asdfasdf</title>'; $matches = []; preg_match('#<title>(.*)</title>#', $mailBody, $matches, 0); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dMttH
function name:  (null)
number of ops:  12
compiled vars:  !0 = $mailBody, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%3Ctitle%3Easdfasdf%3C%2Ftitle%3E'
    4     1        ASSIGN                                                   !1, <array>
    6     2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%23%3Ctitle%3E%28.%2A%29%3C%2Ftitle%3E%23'
          4        SEND_VAR                                                 !0
          5        SEND_REF                                                 !1
          6        SEND_VAL                                                 0
          7        DO_ICALL                                                 
    8     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !1
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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