スラッグからpostオブジェクトを取得

functions.php

<?php
function get_post_by_slug( $post_name, $post_type = 'post' ){
	$args = array(
		'name' => $post_name,
		'post_type' => $post_type,
		'posts_per_page' => 1
	);
	$the_post = get_posts( $args );
	$the_post = $the_post[0];

	return $the_post;
}