我想从子函数更改插件类内方法的输出。php而不更改插件的文件。我想更改的输出是，它使用模板按钮数组，而不是常见的a href。问题是，您得到的方法的输出是一个短代码（下面的这个短代码可以插入到您想要的任何模板中）。我不知道如何从子函数更改此方法。php。我修改了这个插件文件，它可以工作，但这意味着如果不松开新按钮，我就无法更新插件。

echo do_shortcode( \'[bewpi-download-invoice title="Download (PDF) Invoice {formatted_invoice_number}" order_id="\' . $order->id . \'"]\' );

以下是be woocommerce pdf发票中的方法。php类

public function download_invoice_shortcode( $atts ) {
if ( ! isset( $atts[\'order_id\'] ) || 0 === intval( $atts[\'order_id\'] ) ) {
return;
        }

        // by default order status should be Processing or Completed.
        $order = wc_get_order( $atts[\'order_id\'] );
        if ( ! $order->is_paid() ) {
            return;
        }

        if ( ! BEWPI_Invoice::exists( $order->id ) ) {
            return;
        }

        $url = add_query_arg( array(
            \'bewpi_action\' => \'view\',
            \'post\' => $order->id,
            \'nonce\' => wp_create_nonce( \'view\' ),
        ) );

        $invoice = new BEWPI_Invoice( $order->id );
        $tags = array(
            \'{formatted_invoice_number}\' => $invoice->get_formatted_number(),
            \'{order_number}\'             => $order->id,
            \'{formatted_invoice_date}\'   => $invoice->get_formatted_invoice_date(),
            \'{formatted_order_date}\'     => $invoice->get_formatted_order_date(),
        );
        // find and replace placeholders.
        $title = str_replace( array_keys( $tags ), array_values( $tags ), $atts[\'title\'] );
        // MOD OF THE PLUGIN
        thegem_button(array(
            \'tag\' => \'a\',
            \'href\' => esc_attr( $url ),
            \'text\' => esc_html__($title, \'thegem\' ),
            \'style\' => \'outline\',
            \'size\' => \'medium\',
            \'extra_class\' => \'checkout-exit\',
            \'attributes\' => array(
            \'value\' => esc_attr__( $title, \'thegem\' ),
            )
            ), true);
        // ORIGINAL OUTPUT
// printf( \'<a href="%1$s">%2$s</a>\', esc_attr( $url ), esc_html( $title ) );
    }

插件的MOD是我添加的新代码。我把它放在评论中的原始输出。当然欢迎任何建议。提前感谢

add_shortcode( \'custom-bewpi-download-invoice\', \'print_invoice_func\');

function print_invoice_func( $atts ) {
if ( ! isset( $atts[\'order_id\'] ) || 0 === intval( $atts[\'order_id\'] ) ) {
return;
        }

        // by default order status should be Processing or Completed.
        $order = wc_get_order( $atts[\'order_id\'] );
        if ( ! $order->is_paid() ) {
            return;
        }

        if ( ! BEWPI_Invoice::exists( $order->id ) ) {
            return;
        }

        $url = add_query_arg( array(
            \'bewpi_action\' => \'view\',
            \'post\' => $order->id,
            \'nonce\' => wp_create_nonce( \'view\' ),
        ) );

        $invoice = new BEWPI_Invoice( $order->id );
        $tags = array(
            \'{formatted_invoice_number}\' => $invoice->get_formatted_number(),
            \'{order_number}\'             => $order->id,
            \'{formatted_invoice_date}\'   => $invoice->get_formatted_invoice_date(),
            \'{formatted_order_date}\'     => $invoice->get_formatted_order_date(),
        );
        // find and replace placeholders.
        $title = str_replace( array_keys( $tags ), array_values( $tags ), $atts[\'title\'] );
        // MOD OF THE PLUGIN
        thegem_button(array(
            \'tag\' => \'a\',
            \'href\' => esc_attr( $url ),
            \'text\' => esc_html__($title, \'thegem\' ),
            \'style\' => \'outline\',
            \'size\' => \'medium\',
            \'extra_class\' => \'checkout-exit\',
            \'attributes\' => array(
            \'value\' => esc_attr__( $title, \'thegem\' ),
            )
            ), true);
        // ORIGINAL OUTPUT
// printf( \'<a href="%1$s">%2$s</a>\', esc_attr( $url ), esc_html( $title ) );
    }

echo do_shortcode( \'[custom-bewpi-download-invoice title="Download (PDF) Invoice {formatted_invoice_number}" order_id="\' . $order->id . \'"]\' );