WordPress 自定义 WP_Query 循环如何支持 tax_query or meta_query 参数

/** * Modify WP_Query to support 'meta_or_tax' argument * to use OR between meta- and taxonomy query parts. * use '_meta_or_tax' => true in wp_query array */add_filter( 'posts_where', function( $where, \WP_Query $q ){$tax_args = isset( $q->query_vars['tax_query'] ) ? $q->query_vars['tax_query'] : null;$meta_args = isset( $q->query_vars['meta_query'] ) ? $q->query_vars['meta_query'] : null;$meta_or_tax = isset( $q->query_vars['_meta_or_tax'] ) ? wp_validate_boolean( $q->query_vars['_meta_or_tax'] ) : false;// Construct the "tax OR meta" queryif( $meta_or_tax && is_array( $tax_args ) &&  is_array( $meta_args )  )   {global $wpdb;$field = 'ID';// Primary id column$sql_tax = get_tax_sql(  $tax_args,  $wpdb->posts, $field );// Tax query$sql_meta = get_meta_sql( $meta_args, 'post', $wpdb->posts, $field );// Meta query// Modify the 'where' partif( isset( $sql_meta['where'] ) && isset( $sql_tax['where'] ) ) {$where = str_replace( [ $sql_meta['where'], $sql_tax['where'] ], '', $where );$where .= sprintf( ' AND ( %s OR  %s ) ', substr( trim( $sql_meta['where'] ), 4 ), substr( trim( $sql_tax['where']  ), 4 ) );}}return $where;}, PHP_INT_MAX, 2 );

$args = array('post_status'=> 'publish','order'=> 'ASC','nopaging'=> true,'_meta_or_tax'=> true, //用于支持 tax_query OR meta_query 查询'tax_query'=> array('relation'=> 'OR',array('taxonomy'=> 'category','field'=> 'id','terms'=> array(1,2,3),'operator'=> 'IN'), ),'meta_query'=> array(array('key'=> 'Headline','value'=> '''compare'=> '!='),));$query = new WP_Query( $args );