Removing duplicate slashes in URL via .htaccess or PHP

Question

I\'m trying to remove duplicate slashes from URLs. The following .htaccess rule:

RewriteRule ^(.+)//+(.*)$ $1/$2 [L,NC,R=301] 

do NOT work for

Answer 1

This rule won't work for backslashes. You must add a similar rule with backslashes

RewriteRule ^(.+)\\\\+(.*)$ $1\\$2 [L,R]

If you want to replace backslashes with (forward) slashes, use this rule instead

RewriteRule ^(.+)\\\\+(.*)$ $1/$2 [L,R]

And to remove all back-/slashes at the end of the request

RewriteRule ^(.*?)[/\\]+$ $1 [L,R]

and the same when it is a query string

RewriteCond %{QUERY_STRING} ^(.*=.*?)[/\\]+$
RewriteRule ^.*$ $0?%1 [R,L,QSA]

When everything works as you expect, you can change R to R=301.

Never test with 301 enabled, see this answer Tips for debugging .htaccess rewrite rules for details.