Using an empty array as default argument for a reference variable causes it to reference directly to the Empty array singleton

[calvinbaart]

Sample:

function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = false, $ignoreCase = false, array &$processed = [])
{
    $processed []= 10;
}

assertEquals(1, 2);

print_r([]);

PeachPie output:

Array
(
    [0] => 10
)

PHP output:

Array
(
)