apache伪静态问题

[Alice_Su]

伪静态之前：http://localhost/test.php?id=20
伪静态之后：http://localhost/test/20.html

请问规则如何写？

[Cherish_ws]

RewriteRule http://localhost/test.php?id=([0-9]+) http://localhost/test.php?id=$1 http://www.jb51.net/article/47889.htm

[傲雪星枫]

<IfModule mod_rewrite.c>
RewriteEngine On

RewriteRule ^test/(.+?)\.html$ test.php?id=$1 [NC]
</IfModule>