保存草稿或手动自动保存以显示帖子预览。

原型

post_preview()

返回值

(string)  要重定向以显示预览的URL。

源文件

路径:wp-admin/includes/post.php

<?php
...
function post_preview() {
	$post_ID = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;
	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}
	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}
	$is_autosave = false;
	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;
		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] )
			$_POST['post_status'] = 'draft';
		$saved_post_id = wp_create_post_autosave( $post->ID );
	}
	if ( is_wp_error( $saved_post_id ) )
		wp_die( $saved_post_id->get_error_message() );
	$query_args = array();
	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id'] = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );
		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}
		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}
	return get_preview_post_link( $post, $query_args );
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/post_preview/