src/WebhookClient.php
public function clearOutgoingContext($contextName)
    {
        foreach ($this->outgoingContexts as $i => $context) {
            if ($context->getName() == $contextName) {
                unset($this->outgoingContexts[$i]);
            }
        }

        return $this;
    }
public function clearOutgoingContext($contextName)
    {
        foreach ($this->outgoingContexts as $i => $context) {
            if ($context->getName() == $contextName) {
                unset($this->outgoingContexts[$i]);
            }
        }

        return $this;
    }
Clear an existing outgoing context.
Reference: https://dialogflow.com/docs/contexts.

@param string $contextName

@return \Dialogflow\WebhookClient