Option::isSet('foo')

[masicek]

Flag if option is set

Example:

Option::stgring('foo')->value(FALSE)->default(TRUE)

php run.php    --->    $options->get('foo') == TRUE
php run.php --foo    --->    $options->get('foo') == TRUE
php run.php --foo ahoj   --->    $options->get('foo') == 'ahoj'

php run.php    --->    $options->isSet('foo') == FALSE
php run.php --foo    --->    $options->isSet('foo') == TRUE
php run.php --foo ahoj   --->    $options->IsSet('foo') == TRUE