Fix a race condition in alloptions caching

wp-clear-cache.php

<?php
/**
 * Fix a race condition in alloptions caching
 *
 * @link https://core.trac.wordpress.org/ticket/31245
 * @link https://github.com/Automattic/vip-go-mu-plugins-built/blob/master/misc.php#L75
 */
function _knife_maybe_clear_alloptions_cache( $option ) {
	if ( ! wp_installing() ) {
		$alloptions = wp_load_alloptions(); //alloptions should be cached at this point

		if ( isset( $alloptions[ $option ] ) ) { //only if option is among alloptions
			wp_cache_delete( 'alloptions', 'options' );
		}
	}
}

add_action( 'added_option', '_knife_maybe_clear_alloptions_cache' );
add_action( 'updated_option', '_knife_maybe_clear_alloptions_cache' );
add_action( 'deleted_option', '_knife_maybe_clear_alloptions_cache' );