String to array w/keys question

[Mike]

In PHP, how can I get from:

$str = 'foo1="bar1" foo8="bar number 8" foo6="bar6"';

into

Array
(
[foo1] =bar1
[foo8] =bar number 8
[foo6] =bar6
)

I have about 2 dozen OPTIONAL parameters (foo), the $str will contain
0 or more parameters.

Thanks!

Mike