/**
* Sort the list of CIDR blocks, optionally with a custom callback function.
*
* @param array $cidrs A list of CIDR blocks (strings or objects)
* @param Closure $callback Optional callback to perform the sorting.
* See PHP usort documentation for more details.
*/
public static function cidr_sort($cidrs, $callback = null)
{
// all indexes must be a CIDR object
$cidrs = array_map(function ($o) {
return $o instanceof CIDR ? $o : new CIDR($o);
}, $cidrs);
if ($callback === null) {
$callback = function ($a, $b) {
if (0 != ($o = BC::cmp($a->getStart(true), $b->getStart(true)))) {
return $o;
// < or >
}
if ($a->getPrefix() == $b->getPrefix()) {
return 0;
}
return $a->getPrefix() < $b->getPrefix() ? -1 : 1;
};
} elseif (!$callback instanceof \Closure or !is_callable($callback)) {
throw new \InvalidArgumentException("Invalid callback in CIDR::cidr_sort, expected Closure, got " . gettype($callback));
}
usort($cidrs, $callback);
return $cidrs;
}
