正则表达式------命名子模式，做数组的键

$num = "xiaoming 24";
preg_match("/(?P<name>\w+) (?P<age>\d+)$/",$num,$me);
print_r($me);

$str = "/user-account/view/123";
$res = preg_match("@^/(?P<pageff>([a-zA-Z_-]+?))/(?P<action>([a-zA-Z_-]+?))/(?P<id>([^/]+?))$@u",$str,$maches);
print_r($maches);

Array
(
[page] => user-account
[action] => view
[id] => 123
[controller] => default
)