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<?php $str = '00:03:FF:B5:0E:3A 00:03:FF:B6:0E:3A 00:03:FF:B1:0E:3A'; print substr($str, 0, strpos( $str, ' '));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/InMp9
function name:  (null)
number of ops:  12
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '00%3A03%3AFF%3AB5%3A0E%3A3A+00%3A03%3AFF%3AB6%3A0E%3A3A+00%3A03%3AFF%3AB1%3A0E%3A3A'
    3     1        INIT_FCALL                                               'substr'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 0
          4        INIT_FCALL                                               'strpos'
          5        SEND_VAR                                                 !0
          6        SEND_VAL                                                 '+'
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                         $3      
         10        ECHO                                                     $3
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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