array with double key

php7+.php

<?php

class A {
    private $omg = 'A';
    
    function dump() {
        return get_object_vars($this);
    }
}

class B extends A {
    public $omg = 'B';
}

var_dump((new B())->dump());

$q = (new B())->dump();


    
var_dump([
    'is_array' => is_array($q),
    'is_object' => is_object($q),
    'dump' => $q,
    'dump+' => $q + ['omg'=>1],
    '+dump' => ['omg'=>1] + $q
]);

var_dump([
    '0 curr ' . current($q) => $x0 = key($q),
    '1 next ' . next($q)    => $x1 = key($q),
    '2 prev ' . prev($q)    => $x2 = key($q),
    "0 === 1" => $x0 === $x1,
    "0 === 2" => $x0 === $x2,
]);

PHP 7.0 - 7.1 - 7.2 - 7.3RC

array(2) {
  ["omg"]=>
  string(1) "B"
  ["omg"]=>
  string(1) "A"
}
array(5) {
  ["is_array"]=>
  bool(true)
  ["is_object"]=>
  bool(false)
  ["dump"]=>
  array(2) {
    ["omg"]=>
    string(1) "B"
    ["omg"]=>
    string(1) "A"
  }
  ["dump+"]=>
  array(2) {
    ["omg"]=>
    string(1) "B"
    ["omg"]=>
    string(1) "A"
  }
  ["+dump"]=>
  array(1) {
    ["omg"]=>
    int(1)
  }
}
array(5) {
  ["0 curr B"]=>
  string(3) "omg"
  ["1 next A"]=>
  string(3) "omg"
  ["2 prev B"]=>
  string(3) "omg"
  ["0 === 1"]=>
  bool(true)
  ["0 === 2"]=>
  bool(true)
}