YoastSEO WordPress - accessing values in PHP code

.php

<?php
YoastSEO()->meta->for_post($post->ID)->title;
YoastSEO()->meta->for_post($post->ID)->canonical;

// Other values with their default values
// 'canonical'                      => null,
// 'title'                          => null,
// 'description'                    => null,
// 'open_graph_title'               => null,
// 'open_graph_image'               => 'open_graph_image',
// 'open_graph_image_id'            => 'open_graph_image_id',
// 'open_graph_description'         => null,
// 'twitter_title'                  => null,
// 'twitter_image'                  => 'twitter_image',
// 'twitter_image_id'               => null,
// 'twitter_description'            => null,
// 'is_cornerstone'                 => '1',
// 'is_robots_noindex'              => null,
// 'is_robots_nofollow'             => '0',
// 'is_robots_noarchive'            => null,
// 'is_robots_noimageindex'         => null,
// 'is_robots_nosnippet'            => null,
// 'primary_focus_keyword'          => null,
// 'primary_focus_keyword_score'    => null,
// 'readability_score'              => '50',
// 'inclusive_language_score'       => '42',
// 'schema_page_type'               => 'FAQPage',
// 'schema_article_type'            => 'NewsArticle',
// 'estimated_reading_time_minutes' => '11',