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<?php $a = array(100=>'a',200=>'b',300=>'c',400=>'d'); array_unshift($a,'z'); print_R($a); // What you have to do $a = array(100=>'a',200=>'b',300=>'c',400=>'d'); $a = array(0=>'z') + $a; print_R($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/pPBvT
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'array_unshift'
          2        SEND_REF                                                 !0
          3        SEND_VAL                                                 'z'
          4        DO_ICALL                                                 
    4     5        INIT_FCALL                                               'print_r'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
    7     8        ASSIGN                                                   !0, <array>
    8     9        ADD                                              ~5      <array>, !0
         10        ASSIGN                                                   !0, ~5
    9    11        INIT_FCALL                                               'print_r'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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