How can I take a screenshot with Selenium WebDriver?

Question

Is it possible to take a screenshot using Selenium WebDriver?

(Note: Not Selenium Remote Control)

Answer 1

PHP (PHPUnit)

It uses PHPUnit_Selenium extension version 1.2.7:

class MyTestClass extends PHPUnit_Extensions_Selenium2TestCase {
    ...
    public function screenshot($filepath) {
        $filedata = $this->currentScreenshot();
        file_put_contents($filepath, $filedata);
    }

    public function testSomething() {
        $this->screenshot('/path/to/screenshot.png');
    }
    ...
}