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[WordPress] Stop Plugin Execution Without a Dependency
public function __construct( $container ) {
$this->can_run = true;
// If the dependency isn't installed, then add a message and flag execution to stop.
$this->messenger = $container->get( 'settings-messenger');
if ( ! class_exists( 'Acme_Dependency' ) ) {
$this->messenger->add_error_message( 'The dependency is not installed.' );
$this->can_run = false;
public function init() {
if ( ! $this->can_run ) {
add_action( 'admin_notices', array( $this, 'admin_notices' ) );
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