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<?php $a = new stdClass; var_dump(memory_get_usage()); $a->foo = $a; var_dump(memory_get_usage()); unset($a); var_dump(memory_get_usage());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LDGa0
function name:  (null)
number of ops:  22
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    4     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'memory_get_usage'
          5        DO_ICALL                                         $4      
          6        SEND_VAR                                                 $4
          7        DO_ICALL                                                 
    5     8        ASSIGN_OBJ                                               !0, 'foo'
          9        OP_DATA                                                  !0
    6    10        INIT_FCALL                                               'var_dump'
         11        INIT_FCALL                                               'memory_get_usage'
         12        DO_ICALL                                         $7      
         13        SEND_VAR                                                 $7
         14        DO_ICALL                                                 
    7    15        UNSET_CV                                                 !0
    8    16        INIT_FCALL                                               'var_dump'
         17        INIT_FCALL                                               'memory_get_usage'
         18        DO_ICALL                                         $9      
         19        SEND_VAR                                                 $9
         20        DO_ICALL                                                 
         21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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