flush_rewrite_rules() WP 1.0

Remove rewrite rules and then recreate rewrite rules.

✈ 1 time = 0.010174s = extremely slow | 50000 times = 196.39s = extremely slow | PHP 7.1.11, WP 4.9.8

No Hooks.

Null. Nothing.

flush_rewrite_rules( $hard );

$hard(true/false): Whether to update .htaccess (hard flush) or just update rewrite_rules transient (soft flush).
Default: true (hard)

Since 3.0.0

Introduced.

<?php
function flush_rewrite_rules( $hard = true ) {
	global $wp_rewrite;
	$wp_rewrite->flush_rules( $hard );
}