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<?php $x = 0; echo PHP_EOL.'$x = 0;'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = '0'; echo PHP_EOL.'$x = '."'".'0'."'".';'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = ''; echo PHP_EOL.'$x = '."''".';'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = NULL; echo PHP_EOL.'$x = NULL;'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = TRUE; echo PHP_EOL.'$x = TRUE;'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = FALSE; echo PHP_EOL.'$x = FALSE;'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); $x = array(); echo PHP_EOL.'$x = array();'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x)); unset($x); echo PHP_EOL.'unset($x);'.PHP_EOL; var_dump(is_null($x)); var_dump(!empty($x)); var_dump(isset($x)); var_dump(empty($x));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/D8H2k
function name:  (null)
number of ops:  153
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 0
    4     1        ECHO                                                     '%0A%24x+%3D+0%3B%0A'
    5     2        INIT_FCALL                                               'var_dump'
          3        TYPE_CHECK                                    2  ~2      !0
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
    6     6        INIT_FCALL                                               'var_dump'
          7        ISSET_ISEMPTY_CV                                 ~4      !0
          8        BOOL_NOT                                         ~5      ~4
          9        SEND_VAL                                                 ~5
         10        DO_ICALL                                                 
    7    11        INIT_FCALL                                               'var_dump'
         12        ISSET_ISEMPTY_CV                                 ~7      !0
         13        SEND_VAL                                                 ~7
         14        DO_ICALL                                                 
    8    15        INIT_FCALL                                               'var_dump'
         16        ISSET_ISEMPTY_CV                                 ~9      !0
         17        SEND_VAL                                                 ~9
         18        DO_ICALL                                                 
   10    19        ASSIGN                                                   !0, '0'
   11    20        ECHO                                                     '%0A%24x+%3D+%270%27%3B%0A'
   12    21        INIT_FCALL                                               'var_dump'
         22        TYPE_CHECK                                    2  ~12     !0
         23        SEND_VAL                                                 ~12
         24        DO_ICALL                                                 
   13    25        INIT_FCALL                                               'var_dump'
         26        ISSET_ISEMPTY_CV                                 ~14     !0
         27        BOOL_NOT                                         ~15     ~14
         28        SEND_VAL                                                 ~15
         29        DO_ICALL                                                 
   14    30        INIT_FCALL                                               'var_dump'
         31        ISSET_ISEMPTY_CV                                 ~17     !0
         32        SEND_VAL                                                 ~17
         33        DO_ICALL                                                 
   15    34        INIT_FCALL                                               'var_dump'
         35        ISSET_ISEMPTY_CV                                 ~19     !0
         36        SEND_VAL                                                 ~19
         37        DO_ICALL                                                 
   17    38        ASSIGN                                                   !0, ''
   18    39        ECHO                                                     '%0A%24x+%3D+%27%27%3B%0A'
   19    40        INIT_FCALL                                               'var_dump'
         41        TYPE_CHECK                                    2  ~22     !0
         42        SEND_VAL                                                 ~22
         43        DO_ICALL                                                 
   20    44        INIT_FCALL                                               'var_dump'
         45        ISSET_ISEMPTY_CV                                 ~24     !0
         46        BOOL_NOT                                         ~25     ~24
         47        SEND_VAL                                                 ~25
         48        DO_ICALL                                                 
   21    49        INIT_FCALL                                               'var_dump'
         50        ISSET_ISEMPTY_CV                                 ~27     !0
         51        SEND_VAL                                                 ~27
         52        DO_ICALL                                                 
   22    53        INIT_FCALL                                               'var_dump'
         54        ISSET_ISEMPTY_CV                                 ~29     !0
         55        SEND_VAL                                                 ~29
         56        DO_ICALL                                                 
   24    57        ASSIGN                                                   !0, null
   25    58        ECHO                                                     '%0A%24x+%3D+NULL%3B%0A'
   26    59        INIT_FCALL                                               'var_dump'
         60        TYPE_CHECK                                    2  ~32     !0
         61        SEND_VAL                                                 ~32
         62        DO_ICALL                                                 
   27    63        INIT_FCALL                                               'var_dump'
         64        ISSET_ISEMPTY_CV                                 ~34     !0
         65        BOOL_NOT                                         ~35     ~34
         66        SEND_VAL                                                 ~35
         67        DO_ICALL                                                 
   28    68        INIT_FCALL                                               'var_dump'
         69        ISSET_ISEMPTY_CV                                 ~37     !0
         70        SEND_VAL                                                 ~37
         71        DO_ICALL                                                 
   29    72        INIT_FCALL                                               'var_dump'
         73        ISSET_ISEMPTY_CV                                 ~39     !0
         74        SEND_VAL                                                 ~39
         75        DO_ICALL                                                 
   31    76        ASSIGN                                                   !0, <true>
   32    77        ECHO                                                     '%0A%24x+%3D+TRUE%3B%0A'
   33    78        INIT_FCALL                                               'var_dump'
         79        TYPE_CHECK                                    2  ~42     !0
         80        SEND_VAL                                                 ~42
         81        DO_ICALL                                                 
   34    82        INIT_FCALL                                               'var_dump'
         83        ISSET_ISEMPTY_CV                                 ~44     !0
         84        BOOL_NOT                                         ~45     ~44
         85        SEND_VAL                                                 ~45
         86        DO_ICALL                                                 
   35    87        INIT_FCALL                                               'var_dump'
         88        ISSET_ISEMPTY_CV                                 ~47     !0
         89        SEND_VAL                                                 ~47
         90        DO_ICALL                                                 
   36    91        INIT_FCALL                                               'var_dump'
         92        ISSET_ISEMPTY_CV                                 ~49     !0
         93        SEND_VAL                                                 ~49
         94        DO_ICALL                                                 
   38    95        ASSIGN                                                   !0, <false>
   39    96        ECHO                                                     '%0A%24x+%3D+FALSE%3B%0A'
   40    97        INIT_FCALL                                               'var_dump'
         98        TYPE_CHECK                                    2  ~52     !0
         99        SEND_VAL                                                 ~52
        100        DO_ICALL                                                 
   41   101        INIT_FCALL                                               'var_dump'
        102        ISSET_ISEMPTY_CV                                 ~54     !0
        103        BOOL_NOT                                         ~55     ~54
        104        SEND_VAL                                                 ~55
        105        DO_ICALL                                                 
   42   106        INIT_FCALL                                               'var_dump'
        107        ISSET_ISEMPTY_CV                                 ~57     !0
        108        SEND_VAL                                                 ~57
        109        DO_ICALL                                                 
   43   110        INIT_FCALL                                               'var_dump'
        111        ISSET_ISEMPTY_CV                                 ~59     !0
        112        SEND_VAL                                                 ~59
        113        DO_ICALL                                                 
   45   114        ASSIGN                                                   !0, <array>
   46   115        ECHO                                                     '%0A%24x+%3D+array%28%29%3B%0A'
   47   116        INIT_FCALL                                               'var_dump'
        117        TYPE_CHECK                                    2  ~62     !0
        118        SEND_VAL                                                 ~62
        119        DO_ICALL                                                 
   48   120        INIT_FCALL                                               'var_dump'
        121        ISSET_ISEMPTY_CV                                 ~64     !0
        122        BOOL_NOT                                         ~65     ~64
        123        SEND_VAL                                                 ~65
        124        DO_ICALL                                                 
   49   125        INIT_FCALL                                               'var_dump'
        126        ISSET_ISEMPTY_CV                                 ~67     !0
        127        SEND_VAL                                                 ~67
        128        DO_ICALL                                                 
   50   129        INIT_FCALL                                               'var_dump'
        130        ISSET_ISEMPTY_CV                                 ~69     !0
        131        SEND_VAL                                                 ~69
        132        DO_ICALL                                                 
   52   133        UNSET_CV                                                 !0
   53   134        ECHO                                                     '%0Aunset%28%24x%29%3B%0A'
   54   135        INIT_FCALL                                               'var_dump'
        136        TYPE_CHECK                                    2  ~71     !0
        137        SEND_VAL                                                 ~71
        138        DO_ICALL                                                 
   55   139        INIT_FCALL                                               'var_dump'
        140        ISSET_ISEMPTY_CV                                 ~73     !0
        141        BOOL_NOT                                         ~74     ~73
        142        SEND_VAL                                                 ~74
        143        DO_ICALL                                                 
   56   144        INIT_FCALL                                               'var_dump'
        145        ISSET_ISEMPTY_CV                                 ~76     !0
        146        SEND_VAL                                                 ~76
        147        DO_ICALL                                                 
   57   148        INIT_FCALL                                               'var_dump'
        149        ISSET_ISEMPTY_CV                                 ~78     !0
        150        SEND_VAL                                                 ~78
        151        DO_ICALL                                                 
        152      > RETURN                                                   1

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