flush_rewrite_rules( bool $hard = true )

Removes rewrite rules and then recreate rewrite rules.

Contents

Parameters

$hard bool Optional
Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).

Default: true

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More Information

This function is useful when used with custom post types as it allows for automatic flushing of the WordPress rewrite rules (usually needs to be done manually for new custom post types). However, this is an expensive operation so it should only be used when necessary.

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Source

File: wp-includes/rewrite.php. View all references 

function flush_rewrite_rules( $hard = true ) {
	global $wp_rewrite;

	if ( is_callable( array( $wp_rewrite, 'flush_rules' ) ) ) {
		$wp_rewrite->flush_rules( $hard );
	}
}

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Changelog

Changelog
Version Description
3.0.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 7You must log in to vote on the helpfulness of this note
    Contributed by nsrw0rk — 
    register_activation_hook( __FILE__, 'plugin_activation' );
function plugin_activation() {
	update_option('plugin_permalinks_flushed', 0);
}

add_action( 'init', 'custom_query_vars' );
function custom_query_vars() {
	global $wp;

	$wp->add_query_var( 'newfeed' );
	add_rewrite_rule( '^newfeed/([^/]*)/?', 'index.php?newfeed=$matches[1]', 'top' );

	if( !get_option('plugin_permalinks_flushed') ) {

		flush_rewrite_rules(false);
		update_option('plugin_permalinks_flushed', 1);

	}
}
  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 3You must log in to vote on the helpfulness of this note
    Contributed by Arifur Rahman Naim —

    If you want to flush rules while updating posts based on post type: 

    function wpdoc_flush_rules_on_save_posts( $post_id ) {

    // Check the correct post type.
    // Example to check, if the post type isn't 'post' then don't flush, just return.
    if ( ! empty( $_POST['post_type'] && $_POST['post_type'] != 'post' ) {
        return;
    }

    flush_rewrite_rules();

}

add_action( 'save_post', 'wpdoc_flush_rules_on_save_posts', 20, 2);
  4. Skip to note 4 content
    You must log in to vote on the helpfulness of this noteVote results for this note: -2You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    If you’re developing a theme, while building it you can use this snippet of code that will flush rewrite rules when the file containing it is changed, or every 48 hours:

    // do not use on live/production servers
add_action( 'init','maybe_rewrite_rules' );

/**
 * Flush rewrite rules if the current file has changed and at least every 48 hours.
 */
function maybe_rewrite_rules() {
	if ( ! is_admin() ) {
		return;
	}

	$ver = filemtime( __FILE__ ); // Get the file time for this file as the version number
	$defaults = array( 'version' => 0, 'time' => time() );
	$r = wp_parse_args( get_option( __CLASS__ . '_flush', array() ), $defaults );

	if ( $r['version'] != $ver || $r['time'] + 172800 < time() ) { // Flush if ver changes or if 48hrs has passed.
		flush_rewrite_rules();
		// trace( 'flushed' );
		$args = array( 'version' => $ver, 'time' => time() );
		if ( ! update_option( __CLASS__ . '_flush', $args ) )
			add_option( __CLASS__ . '_flush', $args );
	}

}
  5. Skip to note 5 content
    You must log in to vote on the helpfulness of this noteVote results for this note: -2You must log in to vote on the helpfulness of this note
    Contributed by Rolf Allard van Hagen —

    A relatively simple way to flush rewrite rules on activation and deactivation hooks is not using flush_rewrite_rules() at all. Instead just clear the rewrite_rules option to force WordPress to recreate them at the right time.

    Example:

    register_activation_hook( __FILE__, 'wpdocs_wpdev_activate' );

function wpdocs_wpdev_activate() {
	// force rewrite rules to be recreated at the right time
	delete_option( 'rewrite_rules' );
}

    This avoids having to do complicated stuff like registering your custom post types in the activation hook or throwing and catching dedicated db option or transients as suggested in other notes…

  6. Skip to note 6 content
    You must log in to vote on the helpfulness of this noteVote results for this note: -3You must log in to vote on the helpfulness of this note
    Contributed by Codex —

    This is how you would flush rewrite rules when a plugin is activated or deactivated:

    register_deactivation_hook( __FILE__, 'flush_rewrite_rules' );
register_activation_hook( __FILE__, 'wdocs_flush_rewrites' );


/**
 * Flush rewrite rules on activation
 */
function wpdocs_flush_rewrites() {
	// call your CPT registration function here (it should also be hooked into 'init')
	wpdocs_custom_post_types_registration();
	flush_rewrite_rules();
}
  7. Skip to note 7 content
    You must log in to vote on the helpfulness of this noteVote results for this note: -10You must log in to vote on the helpfulness of this note
    Contributed by Ismail — 
    // flush rules and serve new rules instantly without page refresh
add_action('init', function() {
    flush_rewrite_rules();
});
// Or, hook into wp tag, flush rules and do an internal refresh
add_action('wp', function() {
    if( "1" !== get_option("my_rules_have_been_flushed") ) {
        flush_rewrite_rules();
        update_option('my_rules_have_been_flushed', '1');
        // now, redirect the request.
        wp_redirect( $_SERVER['REQUEST_URI'] );
        exit;
    }
});

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