<?php

function give_attr() {
return new DOMAttr('attr', 'value');
}

function print_value($dom_attribute) {
echo $dom_attribute->value;
}

$dom_attribute = give_attr();
//print_value($dom_attribute);
//var_dump($dom_attribute);

the skript crashes at the var_dump if collect_params is greater than 0 in every case. print_value is working if collect_params is less than 3 or tracing is disabled. the return value of give_attr() is always 'null' if collect_return is enabled, which is also wrong but I don't know if it's a different bug).

Conclusion:
the script cashes in the moment xdebug wants to access the properties of \DOMAttr and collect_params != 0. I don't get, why the var_dump is working in the case collect_params is 0 :/