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<?php $arr = []; $var = 1; array_splice($arr, 0, 0, [&$var]); $var = 2; var_dump($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Jb8tT
function name:  (null)
number of ops:  14
compiled vars:  !0 = $arr, !1 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN                                                   !1, 1
    5     2        INIT_FCALL                                               'array_splice'
          3        SEND_REF                                                 !0
          4        SEND_VAL                                                 0
          5        SEND_VAL                                                 0
          6        INIT_ARRAY                                       ~4      !1
          7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
    6     9        ASSIGN                                                   !1, 2
    7    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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