在<?php 块

您也可以尝试var_dump($result->get_error_data()) 此错误消息（&M）；这将是肮脏的方式。

File: wp-admin/plugins.php
42:             $result = activate_plugin($plugin, self_admin_url(\'plugins.php?error=true&plugin=\' . $plugin), is_network_admin() );
43:             if ( is_wp_error( $result ) ) {
44:                 if ( \'unexpected_output\' == $result->get_error_code() ) {
45:                     $redirect = self_admin_url(\'plugins.php?error=true&charsout=\' . strlen($result->get_error_data()) . \'&plugin=\' . $plugin . "&plugin_status=$status&paged=$page&s=$s");
46:                     wp_redirect(add_query_arg(\'_error_nonce\', wp_create_nonce(\'plugin-activation-error_\' . $plugin), $redirect));
47:                     exit;
48:                 } else {
49:                     wp_die($result);
50:                 }
51:             }