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<?php $a = array('052' => 'nanana'); $b = array('042' => 'wayne'); $c = array(42 => 'batman'); $d = array('0fail' => 'bruce'); var_dump(array_merge($a, $b)); var_dump(array_merge($a, $c)); var_dump(array_merge($a, $d));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5tBA3
function name:  (null)
number of ops:  26
compiled vars:  !0 = $a, !1 = $b, !2 = $c, !3 = $d
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        ASSIGN                                                   !1, <array>
   5     2        ASSIGN                                                   !2, <array>
   6     3        ASSIGN                                                   !3, <array>
   8     4        INIT_FCALL                                               'var_dump'
         5        INIT_FCALL                                               'array_merge'
         6        SEND_VAR                                                 !0
         7        SEND_VAR                                                 !1
         8        DO_ICALL                                         $8      
         9        SEND_VAR                                                 $8
        10        DO_ICALL                                                 
   9    11        INIT_FCALL                                               'var_dump'
        12        INIT_FCALL                                               'array_merge'
        13        SEND_VAR                                                 !0
        14        SEND_VAR                                                 !2
        15        DO_ICALL                                         $10     
        16        SEND_VAR                                                 $10
        17        DO_ICALL                                                 
  11    18        INIT_FCALL                                               'var_dump'
        19        INIT_FCALL                                               'array_merge'
        20        SEND_VAR                                                 !0
        21        SEND_VAR                                                 !3
        22        DO_ICALL                                         $12     
        23        SEND_VAR                                                 $12
        24        DO_ICALL                                                 
        25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0