是否可以在查询中以2为增量向帖子/页面添加特定类？
例如
第1篇第2篇第3篇（添加自定义类）第4篇（添加自定义类）第5篇第6篇第7篇（添加自定义类）第8篇（添加自定义类）第9篇如果需要，我不介意使用jQuery。
以2为增量向帖子添加类
4 个回复
最合适的回答,由SO网友:fuxia 整理而成
滤器post_class, 在筛选器回调中使用静态内部计数器：
add_filter( \'post_class\', \'wpse_100804_post_class\' );
function wpse_100804_post_class( $classes )
{
static $counter = 0;
$counter += 1;
switch ( $counter )
{
case 4:
$counter = 0;
case 3:
$classes[] = \'extra\';
}
return $classes;
}
post_class() 像这样：while ( have_posts() )
{
the_post();
?><li <?php post_class(); ?>>
<?php /* more stuff */ ?>
</li>
}
SO网友:s_ha_dum
如果这是一个你可以安全编辑的主题（即你已经构建的主题），那么在你的循环中，以4为周期跟踪帖子。
$qry = new WP_Query("showposts=10");
if ($qry->have_posts()) {
$iter = 0;
while($qry->have_posts()) {
$iter++;
$extra_class = \'\';
$qry->the_post();
if (3 == $iter || 4 == $iter) {
$extra_class = \'extra-class\';
}
echo \'<div \',post_class($extra_class),\'>\';
the_title();
echo \'</div>\';
if (4 == $iter) {
$iter = 0;
}
}
}
SO网友:birgire
这是一个较短的版本，使用modulus 4 在$wp_query->current_post
while ( have_posts() ) : the_post(); ?>
<li <?php echo ( $wp_query->current_post % 4 > 1 ) ? " class=\'custom-class\' " : ""; ?>>
<?php the_title();?>
</li>
endwhile;
$wp_query->current_post % 4 > 1
SO网友:Matthew Boynes
我为这样的事情编写了一个助手函数。这是我所有主题功能的第一件事。php文件。
/**
* Cycle/alternate unlimited values of a given array.
* For instance, if you call this function five times with wp_cycle(\'three\', \'two\', \'one\'),
* you will in return get: three two one three two. This is useful for loops and allows you to
* cycle classes.
* For instance, foreach ($posts as $post) { echo \'<div class="\'.wp_cycle(\'odd\',\'even\').\'">...</div>\'; }
* would alternate between <div class="odd">...</div> and <div class="even">...</div>. Neat, huh?
* You can pass any data as args and as many as you want, e.g. wp_cycle(array(\'foo\', \'bar\'), false, 5, \'silly\')
*
* @param mixed Accepts unlimited args
* @return mixed
* @author Matthew Boynes
*/
function wp_cycle() {
global $wp_cycle_curr_index;
$args = func_get_args();
$fingerprint = substr( sha1( serialize( $args ) ), 0, 7 );
if ( !is_array( $wp_cycle_curr_index) ) $wp_cycle_curr_index = array();
if ( !isset( $wp_cycle_curr_index[ $fingerprint ] ) || !is_int( $wp_cycle_curr_index[ $fingerprint ] ) ) $wp_cycle_curr_index[ $fingerprint ] = -1;
$wp_cycle_curr_index[ $fingerprint ] = ++$wp_cycle_curr_index[ $fingerprint ] % count( $args );
return $args[ $wp_cycle_curr_index[ $fingerprint ] ];
}
<?php while ( have_posts() ) : the_post(); ?>
<div class="<?php post_class( wp_cycle( \'\', \'\', \'custom-class\', \'custom-class\' ) ) ?>">
<!-- ... -->
</div>
<?php endwhile; ?>
结束