Weird PHP7 behavior when calling class property from array key

demo.php

<?php
// Run with PHP 5.x and 7.x to see the differences.

// SETUP
class Test {
  var $property = 1;
}

$array = [
  0 => 'property'
];

// Test
$test = new Test();
$result = $test->$array[0]; // PHP7: "Undefined property: Test::$Array"

var_dump($result);
// Expected $result == 1, got $result == null
// This is caused by a backward incompatible change introduced by the Uniform Variable Syntax RFC.
// See: https://wiki.php.net/rfc/uniform_variable_syntax#backward_incompatible_changes

// Workaround
// Be explicit about precedence
$result = $test->{$array[0]};

var_dump($result);
// $result == 1 as expected