Start collection of code coverage information.
mixed $id:
boolean $clear:
public function start($id, $clear = FALSE) {
if (!is_bool($clear)) {
throw PHP_CodeCoverage_Util_InvalidArgumentHelper::factory(1, 'boolean');
}
if ($clear) {
$this
->clear();
}
$this->currentId = $id;
$this->driver
->start();
}