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Edit File: Debug.php

<?php

namespace WPMailSMTP;

use WPMailSMTP\Admin\DebugEvents\DebugEvents;

/**
 * Class Debug that will save all errors or warnings generated by APIs or SMTP
 * and display in area for administrators.
 *
 * Usage example:
 *      Debug::set( 'Some warning: %s', array( '%s' => $e->getMessage() );
 *      $debug = Debug::get(); // array
 *      $debug = Debug::get_last(); // string
 *
 * @since 1.2.0
 */
class Debug {

/**
	 * Key for options table where all messages will be saved to.
	 *
	 * @since 1.2.0
	 */
	const OPTION_KEY = 'wp_mail_smtp_debug';

/**
	 * Hold the cached error messages.
	 *
	 * @since 3.0.0
	 *
	 * @var array
	 */
	private static $cached_messages;

/**
	 * Save unique debug message to a debug log.
	 * Adds one more to a list, at the end.
	 *
	 * @since 1.2.0
	 * @since 3.0.0 Start saving the Debug Event IDs, instead of error messages.
	 * @since 3.5.0 Returns Event ID.
	 *
	 * @param mixed $message An array or string error message.
	 *
	 * @return bool|int
	 */
	public static function set( $message ) {

if ( empty( $message ) ) {
			return false;
		}

self::clear_cache();

// Log the error message to the Debug Events.
		$event_id = DebugEvents::add( $message );

$all = self::get_raw();

if ( ! empty( $event_id ) ) {
			array_push( $all, $event_id );
		} else {
			if ( ! is_string( $message ) ) {
				$message = wp_json_encode( $message );
			} else {
				$message = wp_strip_all_tags( $message, false );
			}

array_push( $all, $message );
		}

update_option( self::OPTION_KEY, array_unique( $all ), false );

return $event_id;
	}

/**
	 * Remove all messages for a debug log.
	 *
	 * @since 1.2.0
	 */
	public static function clear() {

self::clear_cache();

update_option( self::OPTION_KEY, [], false );
	}

/**
	 * Clear cached error messages.
	 *
	 * @since 3.0.0
	 */
	private static function clear_cache() {

self::$cached_messages = null;
	}

/**
	 * Get the raw DB debug option values.
	 *
	 * @since 3.0.0
	 */
	private static function get_raw() {

$all = get_option( self::OPTION_KEY, [] );

if ( ! is_array( $all ) ) {
			$all = (array) $all;
		}

return $all;
	}

/**
	 * Retrieve all messages from a debug log.
	 *
	 * @since 1.2.0
	 *
	 * @return array
	 */
	public static function get() {

if ( isset( self::$cached_messages ) ) {
			return self::$cached_messages;
		}

$all = self::get_raw();

if ( empty( $all ) ) {
			self::$cached_messages = [];

return [];
		}

$event_ids    = [];
		$old_messages = [];

foreach ( $all as $item ) {
			if ( is_int( $item ) ) {
				$event_ids[] = (int) $item;
			} else {
				$old_messages[] = $item;
			}
		}

$event_messages        = DebugEvents::get_debug_messages( $event_ids );
		self::$cached_messages = array_unique( array_merge( $old_messages, $event_messages ) );

return self::$cached_messages;
	}

/**
	 * Get the last message that was saved to a debug log.
	 *
	 * @since 1.2.0
	 *
	 * @return string
	 */
	public static function get_last() {

$all = self::get();

if ( ! empty( $all ) && is_array( $all ) ) {
			return (string) end( $all );
		}

return '';
	}

/**
	 * Get the proper variable content output to debug.
	 *
	 * @since 1.2.0
	 *
	 * @param mixed $var Variable to output.
	 *
	 * @return string
	 */
	public static function pvar( $var = '' ) {

ob_start();

echo '<code>';

if ( is_bool( $var ) || empty( $var ) ) {
			var_dump( $var );
		} else {
			print_r( $var );
		}

echo '</code>';

$output = ob_get_clean();

return str_replace( array( "\r\n", "\r", "\n" ), '', $output );
	}
}