add_filter( '__construct', 'custom__construct' );

public function custom__construct( $file, $params = array() ) {
    $default_args = array(
        'start_pos'        => 0, // File pointer start.
        'end_pos'          => -1, // File pointer end.
        'lines'            => -1, // Max lines to read.
        'mapping'          => array(), // Column mapping. csv_heading => schema_heading.
        'parse'            => false, // Whether to sanitize and format data.
        'update_existing'  => false, // Whether to update existing items.
        'delimiter'        => '~', // CSV delimiter.
        'prevent_timeouts' => true, // Check memory and time usage and abort if reaching limit.
         'enclosure'        => '"', // The character used to wrap text in the CSV.
    );

    $this->params = wp_parse_args( $params, $default_args );
    $this->file   = $file;

    if ( isset( $this->params['mapping']['from'], $this->params['mapping']['to'] ) ) {
        $this->params['mapping'] = array_combine( $this->params['mapping']['from'], $this->params['mapping']['to'] );
    }

    $this->read_file();
}