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<?php $arr = array(); $element = array_shift($arr) ?: ''; var_dump($element); var_dump($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iZm1B
function name:  (null)
number of ops:  14
compiled vars:  !0 = $arr, !1 = $element
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'array_shift'
          2        SEND_REF                                                 !0
          3        DO_ICALL                                         $3      
          4        JMP_SET                                          ~4      $3, ->6
          5        QM_ASSIGN                                        ~4      ''
          6        ASSIGN                                                   !1, ~4
    4     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
    5    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !0
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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