[WordPress] Redis Object Cache プラグインとか導入するとキャッシュがきつすぎてオプションが保存されない時あるよね ref: https://qiita.com/wokamoto/items/3498bb74d492258585f7

file0.txt

<?php
wp_cache_delete ( 'alloptions', 'options' );
?>

redis-cache-fix.php

<?php
/*
Plugin Name: Redis Object Cache fix
Plugin URI:
Description:
Version: 0.1
Author: DigitalCube
Author URI: https://www.digitalcube.jp/
License: GPLv2 or later
*/

class redis_cache_fix {
    public function __construct() {
        add_action( 'add_option',    array( $this, 'option_cache_flush' ) );
        add_action( 'update_option', array( $this, 'option_cache_flush' ) );
        add_action( 'delete_option', array( $this, 'option_cache_flush' ) );
    }

    // update_option, delete_option 時に cache をフラッシュ
    public function option_cache_flush($option, $old_value = '', $value = ''){
        if ( !empty( $option ) ) {
            wp_cache_delete( $option, 'options' );
            foreach (array('alloptions','notoptions') as $options_name) {
                $options = wp_cache_get( $options_name, 'options' );
                if ( ! is_array($options) ) {
                    $options = array();
                }
                if ( isset($options[$option]) ) {
                    unset($options[$option]);
                    wp_cache_set( $options_name, $options, 'options' );
                }
                unset($options);
            }
        }
        return;
    }
};
new redis_cache_fix();