为什么在此查询中会忽略POST_TYPE？

在下面的查询中，post\\u类型似乎被忽略，导致显示我安装的所有帖子。我做错了什么？

<?php
function filter_where( $where = \'\' ) {
    $where .= " AND post_date > \'2009-03-01\'";
    return $where;
}
add_filter( \'posts_where\', \'filter_where\' );

$posts = query_posts( \'&showposts=-1&post_type=listings\' );

remove_filter( \'posts_where\', \'filter_where\' );

echo \'<ol>\';
foreach ($posts as $post) {
    echo \'<li>\' . get_the_title() . \'</li>\';
}
echo \'</ol>\';
?>

<?php function filter_where( $where = \'\' ) { $where .= " AND post_date > \'2009-03-01\'"; return $where; } add_filter( \'posts_where\', \'filter_where\' ); function parse_wp_query( $query ) { $query->set( \'post_type\', array( \'listings\' ) ); return $query; } add_filter( \'parse_query\', \'parse_wp_query\' ); $posts = query_posts( \'posts_per_page=-1&post_type=listings\' ); remove_filter( \'posts_where\', \'filter_where\' ); remove_filter( \'parse_query\', \'parse_wp_query\' ); echo \'<ol>\'; foreach ($posts as $post) { echo \'<li>\' . get_the_title() . \'</li>\'; } echo \'</ol>\'; ?>

Grouping post-types in loop

当用户从下拉列表中选择特定类别时，将显示多个帖子类型的列表。我想用标题中的帖子类型标题分组显示数据。我不确定如何划分为岗位类型组。我花了一点时间寻找，但没有找到我真正需要的东西。我还试图添加<?php $post_type = get_post_type( $post->ID ); echo $post_type; ?> 但这只是重复（显然）。调用循环<div id=\"content\" role=\"main\" style=\"float:right; width:765px

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Grouping post-types in loop