代码如下:
add_filter( 'woocommerce_shop_order_search_fields',function( $search_fields ) {
$search_fields[] = '_wcst_order_trackno';//字段一
$search_fields[] = '_wcst_additional_companies';//字段二
$search_fields[] = '_wcst_order_trackname';//字段三
return $search_fields;
} );
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