What will be the output of the following PHP code ?<?php$k

What will be the output of the following PHP code ?

<?php
$k = 4;
if (--$k == 4 || $k xor --$k)
{
    echo $k;
}
?>

–$k == 4 is false but k is decremented, the xor gives true if only one of the operands are true, thus 1 xor 0 is true.