如何通过WordPress函数在.htaccess中添加规则

Question

I am trying to add rules in .htaccess via WordPress function which works perfect but always need to update permalink structure to get it added in .htaccess. How can I refresh / reload .htaccess automatically so that new rules can be added without updating permalink structure.

function add_to_htaccess( $rules ) {

$content = <<<EOD
\nAddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE application/x-httpd-php
AddOutputFilterByType DEFLATE application/x-httpd-fastphp
AddOutputFilterByType DEFLATE image/svg+xml
SetOutputFilter DEFLATE\n\n
EOD;
    return $content . $rules;

}
add_filter('mod_rewrite_rules', 'add_to_htaccess');

When I say I have to update permalink structure, I mean I have to go to WP Dashboard > Settings > Permalinks and have to click 'Save'

Answer 1

You can use the flush_rules() WP function to refresh the rewrite rule cache programatically (which also updates the .htacccess), without going to Settings -> Permalinks and having to click save.

Please, note that it is not recommended to call this function on each page load, because it can greatly reduce performance. Instead, make sure that it is called only when necessary.

For more information about it, you can refer to this codex link: http://codex.wordpress.org/Rewrite_API/flush_rules

EDIT Use the following code to flush the rules on plugin activation.

// calling this function will make flush_rules to be called at the end of the PHP execution
function myplugin_enable_flush_rules() {

    global $wp_rewrite;

    // flush the rewrite rules
    $wp_rewrite->flush_rules();

}

// on plugin activation, call the function that will make flush_rules to be called at the end of the PHP execution
register_activation_hook( __FILE__, 'myplugin_enable_flush_rules' );