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<?php
/**
 * Post API: WP_Post class
 *
 * @package WordPress
 * @subpackage Post
 * @since 4.4.0
 */

/**
 * Core class used to implement the WP_Post object.
 *
 * @since 3.5.0
 *
 * @property string $page_template
 *
 * @property-read list<non-negative-int> $ancestors
 * @property-read list<non-negative-int> $post_category
 * @property-read list<non-empty-string> $tags_input
 *
 * @phpstan-type Data_Array array{
 *     ID: non-negative-int,
 *     post_author: numeric-string|'',
 *     post_date: string,
 *     post_date_gmt: string,
 *     post_content: string,
 *     post_title: string,
 *     post_excerpt: string,
 *     post_status: non-empty-string,
 *     comment_status: non-empty-string,
 *     ping_status: non-empty-string,
 *     post_password: string,
 *     post_name: string,
 *     to_ping: string,
 *     pinged: string,
 *     post_modified: string,
 *     post_modified_gmt: string,
 *     post_content_filtered: string,
 *     post_parent: non-negative-int,
 *     guid: string,
 *     menu_order: int,
 *     post_type: non-empty-string,
 *     post_mime_type: string,
 *     comment_count: numeric-string,
 *     filter: 'raw'|'edit'|'db'|'display'|'attribute'|'js'|'sample'|null,
 *     ancestors: list<non-negative-int>,
 *     page_template: string,
 *     post_category: list<non-negative-int>,
 *     tags_input: list<non-empty-string>,
 *     ...
 * }
 */
#[AllowDynamicProperties]
final class WP_Post {

/**
	 * Post ID.
	 *
	 * @since 3.5.0
	 * @var int
	 * @phpstan-var non-negative-int
	 */
	public $ID;

/**
	 * ID of post author.
	 *
	 * A numeric string, for compatibility reasons. May be an empty string for a
	 * default post that has not yet been assigned an author.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var numeric-string|''
	 */
	public $post_author = '0';

/**
	 * The post's local publication time.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_date = '0000-00-00 00:00:00';

/**
	 * The post's GMT publication time.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_date_gmt = '0000-00-00 00:00:00';

/**
	 * The post's content.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_content = '';

/**
	 * The post's title.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_title = '';

/**
	 * The post's excerpt.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_excerpt = '';

/**
	 * The post's status.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var non-empty-string
	 */
	public $post_status = 'publish';

/**
	 * Whether comments are allowed.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var non-empty-string
	 */
	public $comment_status = 'open';

/**
	 * Whether pings are allowed.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var non-empty-string
	 */
	public $ping_status = 'open';

/**
	 * The post's password in plain text.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_password = '';

/**
	 * The post's slug.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_name = '';

/**
	 * URLs queued to be pinged.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $to_ping = '';

/**
	 * URLs that have been pinged.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $pinged = '';

/**
	 * The post's local modified time.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_modified = '0000-00-00 00:00:00';

/**
	 * The post's GMT modified time.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_modified_gmt = '0000-00-00 00:00:00';

/**
	 * A utility DB field for post content.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_content_filtered = '';

/**
	 * ID of a post's parent post.
	 *
	 * @since 3.5.0
	 * @var int
	 * @phpstan-var non-negative-int
	 */
	public $post_parent = 0;

/**
	 * The unique identifier for a post, not necessarily a URL, used as the feed GUID.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $guid = '';

/**
	 * A field used for ordering posts.
	 *
	 * @since 3.5.0
	 * @var int
	 */
	public $menu_order = 0;

/**
	 * The post's type, like post or page.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var non-empty-string
	 */
	public $post_type = 'post';

/**
	 * An attachment's mime type.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	public $post_mime_type = '';

/**
	 * Cached comment count.
	 *
	 * A numeric string, for compatibility reasons.
	 *
	 * @since 3.5.0
	 * @var string
	 * @phpstan-var numeric-string
	 */
	public $comment_count = '0';

/**
	 * Stores the post object's sanitization level.
	 *
	 * Does not correspond to a DB field.
	 *
	 * The 'sample' value is set exclusively by {@see get_sample_permalink()} and is read during permalink previewing.
	 *
	 * @since 3.5.0
	 * @var string|null
	 * @phpstan-var 'raw'|'edit'|'db'|'display'|'attribute'|'js'|'sample'|null
	 */
	public $filter;

/**
	 * Retrieve WP_Post instance.
	 *
	 * @since 3.5.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param int $post_id Post ID.
	 * @return WP_Post|false Post object, false otherwise.
	 *
	 * @phpstan-param int|numeric-string $post_id
	 */
	public static function get_instance( $post_id ) {
		global $wpdb;

$post_id = (int) $post_id;
		if ( $post_id <= 0 ) {
			return false;
		}

$_post = wp_cache_get( $post_id, 'posts' );

if ( ! ( $_post instanceof stdClass ) && ! ( $_post instanceof WP_Post ) ) {
			$_post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d LIMIT 1", $post_id ) );

if ( ! $_post ) {
				return false;
			}

$_post = sanitize_post( $_post, 'raw' );
			wp_cache_add( (int) $_post->ID, $_post, 'posts' );
		} elseif ( empty( $_post->filter ) || 'raw' !== $_post->filter ) {
			$_post = sanitize_post( $_post, 'raw' );
		}

return new WP_Post( $_post );
	}

/**
	 * Constructor.
	 *
	 * @since 3.5.0
	 *
	 * @param object $post Post object.
	 */
	public function __construct( $post ) {
		foreach ( get_object_vars( $post ) as $key => $value ) {
			$this->$key = $value;
		}
	}

/**
	 * Isset-er.
	 *
	 * @since 3.5.0
	 *
	 * @param string $key Property to check if set.
	 * @return bool
	 */
	public function __isset( $key ) {
		if ( 'ancestors' === $key ) {
			return true;
		}

if ( 'page_template' === $key ) {
			return true;
		}

if ( 'post_category' === $key ) {
			return true;
		}

if ( 'tags_input' === $key ) {
			return true;
		}

return metadata_exists( 'post', $this->ID, $key );
	}

/**
	 * Getter.
	 *
	 * @since 3.5.0
	 *
	 * @param string $key Key to get.
	 * @return mixed
	 */
	public function __get( $key ) {
		if ( 'page_template' === $key && $this->__isset( $key ) ) {
			return get_post_meta( $this->ID, '_wp_page_template', true );
		}

if ( 'post_category' === $key ) {
			if ( is_object_in_taxonomy( $this->post_type, 'category' ) ) {
				$terms = get_the_terms( $this, 'category' );
			}

if ( empty( $terms ) || $terms instanceof WP_Error ) {
				return array();
			}

return wp_list_pluck( $terms, 'term_id' );
		}

if ( 'tags_input' === $key ) {
			if ( is_object_in_taxonomy( $this->post_type, 'post_tag' ) ) {
				$terms = get_the_terms( $this, 'post_tag' );
			}

if ( empty( $terms ) || $terms instanceof WP_Error ) {
				return array();
			}

return wp_list_pluck( $terms, 'name' );
		}

// Rest of the values need filtering.
		if ( 'ancestors' === $key ) {
			$value = get_post_ancestors( $this );
		} else {
			$value = get_post_meta( $this->ID, $key, true );
		}

if ( $this->filter ) {
			$value = sanitize_post_field( $key, $value, $this->ID, $this->filter );
		}

return $value;
	}

/**
	 * Applies the provided context filter for the current post.
	 *
	 * If the requested filter was already applied, then it returns without any changes.
	 *
	 * If the 'raw' filter is supplied, then a new instance of the post is obtained and this method _may_ return false
	 * in case the underlying post was deleted.
	 *
	 * @since 3.5.0
	 *
	 * @param string $filter Filter.
	 * @return WP_Post|false
	 *
	 * @phpstan-param 'raw'|'edit'|'db'|'display'|'attribute'|'js' $filter
	 * @phpstan-return (
	 *     $filter is 'raw' ? WP_Post|false : WP_Post
	 * )
	 */
	public function filter( $filter ) {
		if ( $this->filter === $filter ) {
			return $this;
		}

if ( 'raw' === $filter ) {
			return self::get_instance( $this->ID );
		}

return sanitize_post( $this, $filter );
	}

/**
	 * Convert object to array.
	 *
	 * @since 3.5.0
	 *
	 * @return array<string, mixed> Object as array.
	 *
	 * @phpstan-return Data_Array
	 */
	public function to_array() {
		$post = get_object_vars( $this );

foreach ( array( 'ancestors', 'page_template', 'post_category', 'tags_input' ) as $key ) {
			if ( $this->__isset( $key ) ) {
				$post[ $key ] = $this->__get( $key );
			}
		}

/** @var Data_Array $post */
		return $post;
	}
}

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