Keep di52 compatibility

This removes the use of `bind()` in a way that is not compatible with di52 containers.

It also adds a safety net on `send_events()` in the case that `$events` is null

src/Telemetry/Events/Event_Subscriber.php

@@ -21,6 +21,8 @@
  */
 class Event_Subscriber extends Abstract_Subscriber {
 
+	private static $events = [];
+
 	/**
 	 * @inheritDoc
 	 *
@@ -48,17 +50,13 @@ public function register() {
 	public function cache_event( $name, $data ) {
 		$events = [];
 
-		if ( $this->container->has( 'events' ) ) {
-			$events = $this->container->get( 'events' );
-		}
-
-		$events[] = [
+		self::$events[] = [
 			'name'         => $name,
 			'data'         => wp_json_encode( $data ),
 			'stellar_slug' => Config::get_stellar_slug(),
 		];
 
-		$this->container->bind( 'events', $events );
+		self::$events = $events;
 	}
 
 	/**
@@ -69,7 +67,7 @@ public function cache_event( $name, $data ) {
 	 * @return void
 	 */
 	public function send_cached_events() {
-		if ( ! $this->container->has( 'events' ) ) {
+		if ( empty( self::$events ) ) {
 			return;
 		}
 
@@ -82,12 +80,12 @@ public function send_cached_events() {
 				'sslverify' => false,
 				'body'      => [
 					'action' => Event::AJAX_ACTION,
-					'events' => $this->container->get( 'events' ),
+					'events' => self::$events,
 				],
 			]
 		);
 
-		$this->container->bind( 'events', [] );
+		self::$events = [];
 	}
 
 	/**
@@ -101,6 +99,6 @@ public function send_events() {
 		// Get the passed event array.
 		$events = filter_input( INPUT_POST, 'events', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY ); // phpcs:ignore WordPressVIPMinimum.Security.PHPFilterFunctions.RestrictedFilter
 
-		$this->container->get( Event::class )->send_batch( $events );
+		$this->container->get( Event::class )->send_batch( $events ?: [] );
 	}
 }