Update
 suppose there is a domain named  abc.com  
 I rewrite the domain using htaccess 
 DocumentRoot Web root is  /  
 I rewrote the  / src/blog.php  file to abc.com/blog 
, so I hid the filename 
RewriteRule ^blog$ src/blog.php I went to the linode server to send an A directory subdomain to the server 
 called  b.abc.com . 
 points to the same web site root directory as  /  
, that is, using abc.com will be the same as b.abc.com directory 
question
 I want to rewrite the  / app/index.php  file to b.abc.com 
, that is to say, b.abc.com is the same as  / app/index.php  
. How can this be implemented in htaccess? 
