假设您有变量来保存每个变量的自定义值：

• $category
• $tag
• $author
• $search

$custom_query_args = array(
    // Set any default args here 
    // NOTE: This is where you\'d add
    // things like pagination (posts_per_page),
    // order/sort parameters, and the like
    \'posts_per_page\' => 10,
    \'orderby\' => \'date\',
    \'order\' => \'DESC\'
);

// If user defines $category, add it
if ( \'\' != $category ) {
    $custom_query_args[\'cat\'] = $category;
}
// If user defines $tag, add it
if ( \'\' != $tag ) {
    $custom_query_args[\'tag\'] = $tag;
}

// If user defines $author, add it
if ( \'\' != $author ) {
    $custom_query_args[\'author\'] = $author;
}

// If user defines $search, add it
if ( \'\' != $search ) {
    $custom_query_args[\'s\'] = $search;
}

// Run the query
$custom_query = new WP_Query( $custom_query_args );

如果需要，请编辑include a meta query (i.e. custom field) parameter, 您也可以这样做：

假设（用户定义）$post_meta_key 和（静态）$post_meta_key:

// If user defines $post_meta_value, add it
if ( \'\' != $post_meta_value ) {
    $custom_query_args[\'meta_query\'] = array(
        array(
            \'key\' => $post_meta_key,
            \'value\' => $post_meta_value,
            \'compare\' => \'=\',
        )
    );
}