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<?php $arr = ['test'=>'213']; $foo = [ 'rate'=> ($arr['rate'] ?: null) ]; var_dump($foo);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/2GEnP
function name:  (null)
number of ops:  10
compiled vars:  !0 = $arr, !1 = $foo
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        FETCH_DIM_R                                      ~3      !0, 'rate'
          2        JMP_SET                                          ~4      ~3, ->4
          3        QM_ASSIGN                                        ~4      null
          4        INIT_ARRAY                                       ~5      ~4, 'rate'
    4     5        ASSIGN                                                   !1, ~5
    8     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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