代替:

RewriteRule ^sub/file/([0-9]+)/?$ sub/file?num=$1 [L]

试试:

RewriteRule ^sub/file/([0-9]+)/?$ /sub/file.php?num=$1 [L]

[L] 将停止处理规则是正确的，但这也意味着您不能消除 .php 扩展名，因为它的规则低于此规则.还要注意前导斜杠.

You're correct that [L] will stop processing rules, but that also means that you can't eliminate the .php extension since the rule for that is below this one. Also note the leading slash.