wordpress为一定时间内发表的文章添加特殊样式的方法

<?php 
$t1 = $post->post_date;
$t2 = date( "Y-m-d H:i:s" );
$t3 = '24';
$period = ( strtotime( $t2 )-strtotime( $t1 ) )/3600;
if ( $period < $t3 ) { ?>

<?php } else { ?>

<?php } ?>

<?php 
$period = current_time('timestamp') - get_the_time('U');
if ( $period <= 86400 ) { ?>

<?php } else { ?>

<?php } ?>