[WordPress] Redis Test MU-Plugin

redis-test.php

<?php
/*
Plugin Name: Redis Test
Plugin URI: https://wordpress.org/plugins/redis-cache/
Description: Redis connection test.
Author: Till Krüss
Version: 1.0
Author URI: https://till.im/
*/

add_filter( 'debug_bar_panels', function ( $panels ) {
	return array_merge($panels, [new Debug_Bar_Redis_Test]);
} );

class Debug_Bar_Redis_Test {
	function title() {
		return 'Redis Test';
	}

	function is_visible() {
		return true;
	}

	function prerender() { }

	function render() {
		echo '<pre>';
		echo 'Deleting test key...' . PHP_EOL;
		wp_cache_delete( 'redis-test' );

		if (! wp_cache_get( 'redis-test' )) {
			echo 'Test key deleted!' . PHP_EOL;
		} else {
			echo 'Test key could not be deleted!' . PHP_EOL;
		}

		echo 'Storing test key...' . PHP_EOL;
		wp_cache_add( 'redis-test', 'foobar' );

		echo 'Looking up test key...' . PHP_EOL;

		if ( wp_cache_get('redis-test') === 'foobar' ) {
			echo 'Test key found!' . PHP_EOL;
		} else {
			echo 'Test key could not be found!' . PHP_EOL;
		}

		echo 'Deleting test key...' . PHP_EOL;
		wp_cache_delete( 'redis-test' );

		echo '</pre>';
	}
}