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<?php spl_autoload_register(function($class) { var_dump($class); }); var_dump(class_exists('\Foo\Bar/../../../../../../something'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eWhP0
function name:  (null)
number of ops:  11
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'spl_autoload_register'
          1        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FeWhP0%3A2%240'
          2        SEND_VAL                                                 ~0
          3        DO_ICALL                                                 
    4     4        INIT_FCALL                                               'var_dump'
          5        INIT_FCALL                                               'class_exists'
          6        SEND_VAL                                                 '%5CFoo%5CBar%2F..%2F..%2F..%2F..%2F..%2F..%2Fsomething'
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FeWhP0%3A2%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eWhP0
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $class
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
          1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
          4      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FeWhP0%3A2%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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