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Edit File: Notices.php

<?php

class Tribe__Notices {
	/**
	 * Notices to be displayed in the admin
	 * @var array
	 */
	protected $notices = [];

/**
	 * Define an admin notice
	 *
	 * @param string $key
	 * @param string $notice
	 *
	 * @return bool
	 */
	public static function set_notice( $key, $notice ) {

/**
		 * Provides an opportunity to alter the text of admin notices.
		 *
		 * @since 4.5.5
		 *
		 * @param string $notice The notice text.
		 * @param string $key The key of the notice being filtered.
		 *
		 * @return string.
		 */
		$notice = apply_filters( 'tribe_events_set_notice', $notice, $key );

self::instance()->notices[ $key ] = $notice;

return true;
	}

/**
	 * Check to see if an admin notice exists
	 *
	 * @param string $key
	 *
	 * @return bool
	 */
	public static function is_notice( $key ) {
		return ! empty( self::instance()->notices[ $key ] ) ? true : false;
	}

/**
	 * Remove an admin notice
	 *
	 * @param string $key
	 *
	 * @return bool
	 */
	public static function remove_notice( $key ) {
		if ( self::is_notice( $key ) ) {
			unset( self::instance()->notices[ $key ] );

return true;
		} else {
			return false;
		}
	}

/**
	 * Get the admin notices
	 *
	 * @return array
	 */
	public static function get() {
		return self::instance()->notices;
	}

/**
	 * Static Singleton Factory Method
	 *
	 * @return Tribe__Notices
	 */
	public static function instance() {
		static $instance;

if ( ! $instance ) {
			$class_name = __CLASS__;
			$instance = new $class_name;
		}

return $instance;
	}
}

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