I look for perfect url rewriting for good web ranking

[eluser]WebMada[/eluser]
Hello!

For a best google positioning, I avoid URL like /index.php?val= nor /actualites/news/health/1 nor actualites-1-2.html
But this third is almost good

This is the solution that I use, the non-treated URL : www.mysite.com/page-tourism-2-1

In .htaccess

#Réécriture pour les pages statiques
RewriteRule ^page-(.+)-([0-9]+)-([0-9]+)$ index.php/redirect/page/$1/$2/$3 [L,QSA]

That carries to index.php/redirect/page/$1/$2/$3. There is this specific controller (redirect) who gives the final perfect url
=> www.mysite.com/tourism

Code:

function page($KeyWord, $IdStatiqueContent, $IdMenu) {
            $_SESSION["IdMenu"] = $IdMenu;
            //Nettoyage du fichier htaccess avant de lancer une nouvelle page
            $fichier = RootPath() . ".htaccess";
            CleanFile("#[AddBegin]", $fichier );
            
            $redirection = 'RewriteRule ^' . $KeyWord .'$ ./index.php/pagestatique/pagecontent/' .$IdStatiqueContent . ' [L,QSA]';
            //Ecriture dans fichier htacces
            WriteIntoFile($redirection, $fichier);
            
            //Redirection de la page
            header("Location: ". base_url().$KeyWord);
        }

The problem is that I write in the file .htaccess! On line, many persons visit the site and sometimes, it crashes when two or more visitors visit the same link
Another solution???