WP All Import在代码中实现的各种挂钩、操作和过滤器中有许多未记录的特性。进行此类映射的最简单方法是向pmxi_options_options 并添加自定义规则。在导入配置步骤中，这些规则将显示在自定义字段手风琴下。

<?php
add_filter( \'pmxi_options_options\', function( $options ) {
  // Match the desired custom post type
  if ( $options[\'custom_type\'] != \'product\' ) {
    return $options;
  }
  // Configure the custom fields
  $options[\'custom_name\'][\'custom_field_name\'] = \'_custom_field_name\';
  $options[\'custom_value\'][\'custom_field_name\'] = \'{csv_column[1]}\';
  $options[\'custom_mapping_rules\'][\'custom_field_name\'] = json_encode( [
    \'value_from_csv\' => \'value_to_custom_field\',
    \'en\' => \'English\',
  ] );
  return $options;
} );