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<?php $x = [0, 1]; unset($x[1]); $y = $x; $x[] = 'new'; $y[] = 'new'; last($x); last($y); var_dump(key($x)); var_dump(key($y));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/8PLRc
function name:  (null)
number of ops:  26
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        UNSET_DIM                                                !0, 1
    5     2        ASSIGN                                                   !1, !0
    6     3        ASSIGN_DIM                                               !0
          4        OP_DATA                                                  'new'
    7     5        ASSIGN_DIM                                               !1
          6        OP_DATA                                                  'new'
    9     7        INIT_FCALL_BY_NAME                                       'last'
          8        SEND_VAR_EX                                              !0
          9        DO_FCALL                                      0          
         10        INIT_FCALL_BY_NAME                                       'last'
         11        SEND_VAR_EX                                              !1
         12        DO_FCALL                                      0          
   11    13        INIT_FCALL                                               'var_dump'
         14        INIT_FCALL                                               'key'
         15        SEND_VAR                                                 !0
         16        DO_ICALL                                         $8      
         17        SEND_VAR                                                 $8
         18        DO_ICALL                                                 
   12    19        INIT_FCALL                                               'var_dump'
         20        INIT_FCALL                                               'key'
         21        SEND_VAR                                                 !1
         22        DO_ICALL                                         $10     
         23        SEND_VAR                                                 $10
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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