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<?php $x = serialize(new __PHP_Incomplete_Class('foo')); var_dump(unserialize($x)); // Did I succeed?
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RZBRR
function name:  (null)
number of ops:  14
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'serialize'
          1        NEW                                              $1      '__PHP_Incomplete_Class'
          2        SEND_VAL_EX                                              'foo'
          3        DO_FCALL                                      0          
          4        SEND_VAR                                                 $1
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !0, $3
    4     7        INIT_FCALL                                               'var_dump'
          8        INIT_FCALL                                               'unserialize'
          9        SEND_VAR                                                 !0
         10        DO_ICALL                                         $5      
         11        SEND_VAR                                                 $5
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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