/**
* Comparsion function for sort_domains()
*
* @access private
*/
function sort_cmp_funct($a, $b)
{
/* separate the domain names to top-level and the rest
top-level parts are in x_tail variable, the rests are in x_nose
*/
if (false === ($dot = strrpos($a, "."))) {
$a_nose = "";
$a_tail = $a;
} else {
$a_nose = substr($a, 0, $dot);
$a_tail = substr($a, $dot + 1);
}
if (false === ($dot = strrpos($b, "."))) {
$b_nose = "";
$b_tail = $b;
} else {
$b_nose = substr($b, 0, $dot);
$b_tail = substr($b, $dot + 1);
}
/* domain names are equal */
if ($a_tail == $b_tail and $a_tail == '') {
return 0;
}
/* top-levels are equal call this function recursively to the rests of domain names */
if ($a_tail == $b_tail) {
return Domains::sort_cmp_funct($a_nose, $b_nose);
}
/* compare the top levels */
if ($a_tail < $b_tail) {
return -1;
} else {
return 1;
}
}
