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   Contributed by Codex — 3 years ago

   This is how you would flush rules on theme activation:

   /* Flush rewrite rules for custom post types. */
   add_action( 'after_switch_theme', 'flush_rewrite_rules' );
   
   
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   Contributed by Codex — 3 years ago

   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() {
   
   	$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 );
   	}
   
   }
   
   

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   Contributed by A.R.Naim — 12 months ago

   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);
   

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   Contributed by Codex — 3 years ago

   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();
   }
   
   
   

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   Contributed by Samuel Elh — 2 years ago

   // 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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