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<?php define('GTDU', strstr('file:///school.nestonline.jp/', '//')); var_dump(GTDU);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/NIK6r
function name:  (null)
number of ops:  13
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'define'
         1        SEND_VAL                                                 'GTDU'
         2        INIT_FCALL                                               'strstr'
         3        SEND_VAL                                                 'file%3A%2F%2F%2Fschool.nestonline.jp%2F'
         4        SEND_VAL                                                 '%2F%2F'
         5        DO_ICALL                                         $0      
         6        SEND_VAR                                                 $0
         7        DO_ICALL                                                 
   3     8        INIT_FCALL                                               'var_dump'
         9        FETCH_CONSTANT                                   ~2      'GTDU'
        10        SEND_VAL                                                 ~2
        11        DO_ICALL                                                 
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0