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The site has been presenting the error for some time:
Your PHP installation appears to be Missing the Mysql Extension which is required by Wordpress.
I checked with the hosting server and we noticed that the version of PHP is incompatible with the version of wordpress installed, While trying to update the PHP writing a line on .htaccess the same is always rewritten (deleting the typed line), the server in question is the locaweb.
I also tried to "restore" the file nav-menu to see if it would solve this rewriting problem of .htaccessbut without success, I also noticed that when searching the site on google the same shows the title of the site in Japanese/Chinese/Koreano so I suspect that it was a hacker attack because the wordpress the site was long overdue without being updated.
What other methods can I try to restore the site? (request rollback to the server this out of question, the service provider reported that it only keeps the 7 days backup)
This error concerns Mysql and not the PHP version, you have to search on
php.iniof the Mysql extension is enabled, apparently not.– Kenny Rafael
@Kennyrafael already contacted Locaweb and they informed that this error is generated due to php version and this impacts on mysql driver configuration.
– RFL