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<?php $os = new SplObjectStorage; $obj = new StdClass; $os->attach($obj); var_dump($os->count()); var_dump($os->detach($obj), $os->count()); var_dump($os->detach($obj), $os->count());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ad8AK
function name:  (null)
number of ops:  33
compiled vars:  !0 = $os, !1 = $obj
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $2      'SplObjectStorage'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
    5     3        NEW                                              $5      'StdClass'
          4        DO_FCALL                                      0          
          5        ASSIGN                                                   !1, $5
    7     6        INIT_METHOD_CALL                                         !0, 'attach'
          7        SEND_VAR_EX                                              !1
          8        DO_FCALL                                      0          
    8     9        INIT_FCALL                                               'var_dump'
         10        INIT_METHOD_CALL                                         !0, 'count'
         11        DO_FCALL                                      0  $9      
         12        SEND_VAR                                                 $9
         13        DO_ICALL                                                 
    9    14        INIT_FCALL                                               'var_dump'
         15        INIT_METHOD_CALL                                         !0, 'detach'
         16        SEND_VAR_EX                                              !1
         17        DO_FCALL                                      0  $11     
         18        SEND_VAR                                                 $11
         19        INIT_METHOD_CALL                                         !0, 'count'
         20        DO_FCALL                                      0  $12     
         21        SEND_VAR                                                 $12
         22        DO_ICALL                                                 
   10    23        INIT_FCALL                                               'var_dump'
         24        INIT_METHOD_CALL                                         !0, 'detach'
         25        SEND_VAR_EX                                              !1
         26        DO_FCALL                                      0  $14     
         27        SEND_VAR                                                 $14
         28        INIT_METHOD_CALL                                         !0, 'count'
         29        DO_FCALL                                      0  $15     
         30        SEND_VAR                                                 $15
         31        DO_ICALL                                                 
         32      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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