How to send a Signal from a Client in PHP

To send a Signal to a Workflow Execution from a Client, call the Signal method, annotated with #[SignalMethod] in the Workflow interface, from the Client code.

To send signal to workflow use WorkflowClient->newWorkflowStub or WorkflowClient->newUntypedWorkflowStub:

$workflow = $workflowClient->newWorkflowStub(YourWorkflow::class);

$run = $workflowClient->start($workflow);

// do something

$workflow->setValue(true);

assert($run->getValue() === true);

Use WorkflowClient->newRunningWorkflowStub or WorkflowClient->newUntypedRunningWorkflowStub with workflow id to send signals to already running workflows.

$workflow = $workflowClient->newRunningWorkflowStub(YourWorkflow::class, 'workflowID');
$workflow->setValue(true);

See Handle Signals for details on how to handle Signals in a Workflow.