描述：

获取指定文章

用法：

<?php
	$post = get_post( 8 );
	$title = $post->post_title;
	$excerpt = $post->post_excerpt;
	$content = $post->post_content;
?>

参数：

$post

整数 默认值：null

文章的ID，或对象

$output

字符串 默认值：OBJECT

指定返回数据的类型，可用的值如下：

• OBJECT：对象；
• ARRAY_A：数组，升序排列；
• ARRAY_N：数组，降序排列；

$filter

字符串 默认值：raw

要应用的过滤类型

返回值：

此函数返回包括文章内容、标题、别名、摘要、发布时间等信息

WP_Post Object (
	[ID] => 121
	[post_author] => 1
	[post_date] => 2019-12-04 09 21:44:29
	[post_date_gmt] => 2019-12-04 09 13:44:29
	[post_content] => 文章内容
	[post_title] => 文章标题
	[post_excerpt] => 文章摘要
	[post_status] => publish
	[comment_status] => open
	[ping_status] => closed
	[post_password] =>
	[post_name] => 文章别名
	[to_ping] =>
	[pinged] =>
	[post_modified] => 2019-12-04 09:04:53
	[post_modified_gmt] => 2019-12-04 09 01:04:53
	[post_content_filtered] =>
	[post_parent] => 0
	[guid] => https://www.beizigen.com/?p=121
	[menu_order] => 0
	[post_type] => post
	[post_mime_type] =>
	[comment_count] => 0
	[filter] => raw
)

源文件：

/**
 * Retrieves post data given a post ID or post object.
 *
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
 * @global WP_Post $post
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 *                                 or 'display'. Default 'raw'.
 * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 *                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
	if ( empty( $post ) && isset( $GLOBALS['post'] ) ) {
		$post = $GLOBALS['post'];
	}

	if ( $post instanceof WP_Post ) {
		$_post = $post;
	} elseif ( is_object( $post ) ) {
		if ( empty( $post->filter ) ) {
			$_post = sanitize_post( $post, 'raw' );
			$_post = new WP_Post( $_post );
		} elseif ( 'raw' == $post->filter ) {
			$_post = new WP_Post( $post );
		} else {
			$_post = WP_Post::get_instance( $post->ID );
		}
	} else {
		$_post = WP_Post::get_instance( $post );
	}

	if ( ! $_post ) {
		return null;
	}

	$_post = $_post->filter( $filter );

	if ( $output == ARRAY_A ) {
		return $_post->to_array();
	} elseif ( $output == ARRAY_N ) {
		return array_values( $_post->to_array() );
	}

	return $_post;
}