求帮：php如何用正则获取浮点数

$str = 'tmap 116.123456,39.123456';
preg_match_all('/[^\s]+/', $str, $match);
$numstr = $match[0][1];
print_r(explode(',',$numstr));

$s = 'tmap 116.123456,39.123456';
preg_match_all('/[\d.]+/', $s, $r);
print_r($r[0]);

Array
(
    [0] => 116.123456
    [1] => 39.123456
)

$s='tmap 116.123456,39.123456';
$ar = preg_split('/[\s,]+/',$s);
print_r($ar);

$str = 'tmap 116.123456,39.123456';
print_r(preg_split('/[\s,]/', $str));