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<?php $a = 0; var_dump($a ?: 'a'); // empty var_dump($a ?? 'a'); // isset $a = ''; var_dump($a ?: 'a'); // empty var_dump($a ?? 'a'); // isset $a = false; var_dump($a ?: 'a'); // empty var_dump($a ?? 'a'); // isset $a = null; var_dump($a ?: 'a'); // empty var_dump($a ?? 'a'); // isset
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/X7RGp
function name:  (null)
number of ops:  45
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 0
    5     1        INIT_FCALL                                               'var_dump'
          2        JMP_SET                                          ~2      !0, ->4
          3        QM_ASSIGN                                        ~2      'a'
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
    6     6        INIT_FCALL                                               'var_dump'
          7        COALESCE                                         ~4      !0
          8        QM_ASSIGN                                        ~4      'a'
          9        SEND_VAL                                                 ~4
         10        DO_ICALL                                                 
    8    11        ASSIGN                                                   !0, ''
   10    12        INIT_FCALL                                               'var_dump'
         13        JMP_SET                                          ~7      !0, ->15
         14        QM_ASSIGN                                        ~7      'a'
         15        SEND_VAL                                                 ~7
         16        DO_ICALL                                                 
   11    17        INIT_FCALL                                               'var_dump'
         18        COALESCE                                         ~9      !0
         19        QM_ASSIGN                                        ~9      'a'
         20        SEND_VAL                                                 ~9
         21        DO_ICALL                                                 
   13    22        ASSIGN                                                   !0, <false>
   15    23        INIT_FCALL                                               'var_dump'
         24        JMP_SET                                          ~12     !0, ->26
         25        QM_ASSIGN                                        ~12     'a'
         26        SEND_VAL                                                 ~12
         27        DO_ICALL                                                 
   16    28        INIT_FCALL                                               'var_dump'
         29        COALESCE                                         ~14     !0
         30        QM_ASSIGN                                        ~14     'a'
         31        SEND_VAL                                                 ~14
         32        DO_ICALL                                                 
   18    33        ASSIGN                                                   !0, null
   20    34        INIT_FCALL                                               'var_dump'
         35        JMP_SET                                          ~17     !0, ->37
         36        QM_ASSIGN                                        ~17     'a'
         37        SEND_VAL                                                 ~17
         38        DO_ICALL                                                 
   21    39        INIT_FCALL                                               'var_dump'
         40        COALESCE                                         ~19     !0
         41        QM_ASSIGN                                        ~19     'a'
         42        SEND_VAL                                                 ~19
         43        DO_ICALL                                                 
         44      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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