public static function blank($check)
	{
		if (is_array($check))
		{
			extract(self::_defaults($check));
		}
		return !self::_check($check, '/[^\\s]/');
	}
public static function blank($check)
	{
		if (is_array($check))
		{
			extract(self::_defaults($check));
		}
		return !self::_check($check, '/[^\\s]/');
	}
public static function blank ( $ check ) { if ( is_array ( $ check ) ) { extract ( self :: _defaults ( $ check ) ) ; } return ! self :: _check ( $ check , '/[^\\s]/' ) ; }
Returns true if field is left blank -OR- only whitespace characters are present in its value
Whitespace characters include Space, Tab, Carriage Return, Newline

$check can be passed as an array:
array('check' => 'valueToCheck');

@param   string|array  $check  Value to check
@return  boolean  Success
Returns true if field is left blank - OR - only whitespace characters are present in its value Whitespace characters include Space Tab Carriage Return Newline