Object Interfaces
Object interfaces allow you to create code which specifies which methods a
class must implement, without having to define how these methods are
handled.
Interfaces are defined using the interface keyword, in the same way as a
standard class, but without any of the methods having their contents
defined.
All methods declared in an interface must be public, this is the nature of an
interface.
<literal>implements</literal>
To implement an interface, the implements operator is used.
All methods in the interface must be implemented within a class; failure to do
so will result in a fatal error. Classes may implement more than one interface
if desired by separating each interface with a comma.
&reftitle.examples;
Interface example
vars[$name] = $var;
}
public function getHtml($template)
{
foreach($this->vars as $name => $value) {
$template = str_replace('{' . $name . '}', $value, $template);
}
return $template;
}
}
// This will not work
// Fatal error: Class BadTemplate contains 1 abstract methods
// and must therefore be declared abstract (iTemplate::getHtml)
class BadTemplate implements iTemplate
{
private $vars = array();
public function setVariable($name, $var)
{
$this->vars[$name] = $var;
}
}
?>
]]>
See also the instanceof
operator.