如何阻止.htaccess中的重写规则被Wordpress删除？

Question

I am developing a plugin which rewrites a specific URL pattern to a directory within the plugin. To add these rules I call add_rewrite_rule() in the plugin activation function before calling flush_rewrite_rules(). This does a great job of creating the rewrite rules, but somehow they get removed sometimes.

In one case, I changed the permalink structure for posts. Wordpress seemingly regenerated the .htaccess file without my rules. To regenerate the rules I had to deactivate and reactivate the plugin. This surprised me because I was under the impression that calling flush_rewrite_rules() inventories existing rules before adding new ones and regenerating .htaccess file. Something in my system seems to be regenerating the file without inventorying the existing rules first.

In another case, I added some plugins and I think one of them regenerated the .htaccess file when it was activated.

Is there any way to stop Wordpress and other plugins from removing my rules from the .htaccess file?

If there is some way to flag rules so that Wordpress cannot remove them in the future that would be great. Like if you could add a special character or something that tells Wordpress never to remove that specific rule for any reason other than a directive to remove it originating from the plugin which created it.

What I cannot entertain would be making the .htaccess file unwritable via file permissions because it must be writable for Wordpress to create the rules in the first place. I also believe that I cannot add the rules on init because this is a plugin not a theme. This is my first plugin which uses rewrite rules, so I could be wrong about this but according to my research so far you're supposed to add rewrite rules from plugins on activation not init.

Answer 1

Use the 'save_mod_rewrite_rules' filter to modify the .htaccess rules before they are saved.You can use this filter to include your plugin's rewrite rules in the .htaccess file, before the file is saved.

 function my_mod_rewrite_rules( $rules ) {
    // Get your plugin's rewrite rules
    $my_rules = my_get_rewrite_rules();

    // Add your plugin's rewrite rules to the beginning of the $rules string
    $rules = $my_rules . $rules;

    return $rules;
}


add_filter( 'mod_rewrite_rules', 'my_mod_rewrite_rules' );

You can use this filter in your plugin's activation function, to add your plugin's rewrite rules to the .htaccess file when your plugin is activated.

Good luck !