WP_Post

Core class used to implement the WP_Post object.


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Role of WP_Post Role of WP_Post

The WP_Post class is used to contain post objects stored by the database and is returned by functions such as get_post.

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Member Variables of WP_Post Member Variables of WP_Post

As of WordPress Version 3.5.1

Member Variable Variable Type Notes
ID int The ID of the post
post_author string The post author’s user ID (numeric string)
post_name string The post’s slug
post_type string See Post Types
post_title string The title of the post
post_date string Format: 0000-00-00 00:00:00
post_date_gmt string Format: 0000-00-00 00:00:00
post_content string The full content of the post
post_excerpt string User-defined post excerpt
post_status string See get_post_status for values
comment_status string Returns: { open, closed }
ping_status string Returns: { open, closed }
post_password string Returns empty string if no password
post_parent int Parent Post ID (default 0)
post_modified string Format: 0000-00-00 00:00:00
post_modified_gmt string Format: 0000-00-00 00:00:00
comment_count string Number of comments on post (numeric string)
menu_order string Order value as set through page-attribute when enabled (numeric string. Defaults to 0)

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Source Source

File: wp-includes/class-wp-post.php

final class WP_Post {

	/**
	 * Post ID.
	 *
	 * @since 3.5.0
	 * @var int
	 */
	public $ID;

	/**
	 * ID of post author.
	 *
	 * A numeric string, for compatibility reasons.
	 *
	 * @since 3.5.0
	 * @var 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
	 */
	public $post_status = 'publish';

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

	/**
	 * Whether pings are allowed.
	 *
	 * @since 3.5.0
	 * @var 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
	 */
	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
	 */
	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
	 */
	public $comment_count = 0;

	/**
	 * Stores the post object's sanitization level.
	 *
	 * Does not correspond to a DB field.
	 *
	 * @since 3.5.0
	 * @var string
	 */
	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.
	 */
	public static function get_instance( $post_id ) {
		global $wpdb;

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

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

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

		return new WP_Post( $_post );
	}

	/**
	 * Constructor.
	 *
	 * @since 3.5.0
	 *
	 * @param WP_Post|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 ) ) {
				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 ) ) {
				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;
	}

	/**
	 * {@Missing Summary}
	 *
	 * @since 3.5.0
	 *
	 * @param string $filter Filter.
	 * @return array|bool|object|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 Object as 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 );
			}
		}

		return $post;
	}
}

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Methods Methods


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Changelog Changelog

Changelog
Version Description
3.5.0 Introduced.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    Contributed by Priyanka Behera

    Please Note: While the above method is fine for retrieving the post ID, you should not use the above method for displaying post_content and other filtered elements (such as post_title). You should instead use either the_content if you are in the loop, or apply_filters if outside the loop, so it would look like this

    $examplePost = get_post();
    
    echo $examplePost->post_content; // Don't do this
    
    echo apply_filters( 'the_content', $examplePost->post_content ); // Do this instead
    
  2. Skip to note 3 content
    Contributed by lovor

    I found a longer list of member variables for WP_Post object than documented above, at least for menu item WP_Post object and WordPress v5.5.1. Additional variables are:

    Member variable Variable type

    to_ping string
    pinged string
    post_content_filtered string
    guid string
    post_mime_type string
    filter string
    db_id integer
    menu_item_parent string
    object_id string
    object string
    type string
    type_label string
    url string
    title string

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