if (XML_SAX_IMPL == 'libxml') {
$php = getenv('TEST_PHP_EXECUTABLE');
preg_match("/^libxml2 Version.*\$/im", `$php -i`, $match);
preg_match("/^libxml2 Version.*\$/im", `$php -n -i`, $match);
echo $match[0], "\n";
} else {
echo "libxml2 Version => NONE\n";