src/Action/Responses/BasicCard.php
public function image($imageUrl, $accessibilityText = null)
    {
        $this->imageUrl = $imageUrl;
        $this->accessibilityText = $accessibilityText;

        return $this;
    }
public function image($imageUrl, $accessibilityText = null)
    {
        $this->imageUrl = $imageUrl;
        $this->accessibilityText = $accessibilityText;

        return $this;
    }
Set the image for a Card.

@param string $imageUrl          image URL
@param string $accessibilityText (optional) accessibility text of the image

@return Dialogflow\Action\Responses\BasicCard