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<?php $foo = (1 === '1') ?: 'bar'; var_dump($foo); $foo = (1 === 1) ?: 'bar'; var_dump($foo); $foo = (1 !== 1) ?: $bar; var_dump($foo);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/maIRb
function name:  (null)
number of ops:  19
compiled vars:  !0 = $foo, !1 = $bar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   JMP_SET                                          ~2      <false>, ->2
          1        QM_ASSIGN                                        ~2      'bar'
          2        ASSIGN                                                   !0, ~2
    4     3        INIT_FCALL                                               'var_dump'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                                 
    6     6        JMP_SET                                          ~5      <true>, ->8
          7        QM_ASSIGN                                        ~5      'bar'
          8        ASSIGN                                                   !0, ~5
    7     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                                 
    9    12        JMP_SET                                          ~8      <false>, ->14
         13        QM_ASSIGN                                        ~8      !1
         14        ASSIGN                                                   !0, ~8
   10    15        INIT_FCALL                                               'var_dump'
         16        SEND_VAR                                                 !0
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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