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<?php |
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/** |
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* Compatibility functions for the Creative Mail plugin. |
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* https://wordpress.org/plugins/creative-mail-by-constant-contact/ |
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* |
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* @since 8.9.0 |
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* |
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* @package Jetpack |
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*/ |
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namespace Automattic\Jetpack\Creative_Mail; |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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const PLUGIN_SLUG = 'creative-mail-by-constant-contact'; |
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const PLUGIN_FILE = 'creative-mail-by-constant-contact/creative-mail-plugin.php'; |
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add_action( 'admin_notices', __NAMESPACE__ . '\error_notice' ); |
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add_action( 'admin_init', __NAMESPACE__ . '\try_install' ); |
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/** |
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* Verify the intent to install Creative Mail, and kick off installation. |
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* |
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* This works in tandem with a JITM set up in the JITM package. |
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*/ |
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function try_install() { |
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if ( ! isset( $_GET['creative-mail-action'] ) ) { |
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return; |
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} |
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check_admin_referer( 'creative-mail-install' ); |
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$result = false; |
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// Attempt to install and activate the plugin. |
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if ( current_user_can( 'activate_plugins' ) ) { |
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switch ( $_GET['creative-mail-action'] ) { |
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case 'install': |
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$result = install_and_activate(); |
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break; |
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case 'activate': |
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$result = activate(); |
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break; |
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} |
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} |
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if ( $result ) { |
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$redirect = admin_url( 'admin.php?page=creativemail' ); |
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} else { |
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$redirect = add_query_arg( 'creative-mail-install-error', true, $redirect ); |
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} |
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wp_safe_redirect( $redirect ); |
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exit; |
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} |
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/** |
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* Install and activate the Creative Mail plugin. |
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* |
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* @return bool result of installation |
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*/ |
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function install_and_activate() { |
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jetpack_require_lib( 'plugins' ); |
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$result = \Jetpack_Plugins::install_and_activate_plugin( PLUGIN_SLUG ); |
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if ( is_wp_error( $result ) ) { |
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return false; |
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} else { |
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return true; |
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} |
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} |
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/** |
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* Activate the Creative Mail plugin. |
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* |
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* @return bool result of activation |
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*/ |
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function activate() { |
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$result = activate_plugin( PLUGIN_FILE ); |
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// Activate_plugin() returns null on success. |
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return is_null( $result ); |
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} |
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/** |
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* Notify the user that the installation of Creative Mail failed. |
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*/ |
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function error_notice() { |
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if ( empty( $_GET['creative-mail-install-error'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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return; |
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} |
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?> |
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<div class="notice notice-error is-dismissible"> |
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<p><?php esc_html_e( 'There was an error installing Creative Mail.', 'jetpack' ); ?></p> |
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</div> |
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<?php |
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} |
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Automattic /
jetpack
This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$xwould be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.