PHPのエラー『Notice: Only Variables Should be Passed by Reference』の解決方法

<?php
$array = [1, 2, 3];
$lastElement = end([1, 2, 3]); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3];
$lastElement = end($array + [4, 5, 6]); // Notice: Only variables should be passed by reference
?>

<?php
function getArray() {
    return [1, 2, 3];
}

$lastElement = end(getArray()); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3];
$lastElement = end($array[0]); // Notice: Only variables should be passed by reference
?>

<?php
class MyClass {
    public $property = [1, 2, 3];
}

$obj = new MyClass();
$lastElement = end($obj->property[0]); // Notice: Only variables should be passed by reference
?>

<?php
$string = 'Hello, World!';
$lastCharacter = end(substr($string, 0, 5)); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3, 4, 5];
$lastElement = end(array_slice($array, 0, 3)); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3, 4, 5];
$lastElement = end(array_filter($array, function($value) {
    return $value > 2;
})); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3, 4, 5];
$lastElement = end(array_map(function($value) {
    return $value * 2;
}, $array)); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3, 4, 5];
$lastElement = end(array_reduce($array, function($carry, $item) {
    return $carry + $item;
}, 0)); // Notice: Only variables should be passed by reference
?>

<?php
$array = [3, 1, 4, 1, 5, 9];
$lastElement = end(sort($array)); // Notice: Only variables should be passed by reference
?>

<?php
$array = [1, 2, 3, 4, 5];
$lastElement = end(array_reverse($array)); // Notice: Only variables should be passed by reference
?>