1.3 KiB
A property is defined by a getter method (e.g. getLabel), and/or a setter method (e.g. setLabel). For example,
the following getter and setter methods define a property named label:
private $_label;
public function getLabel()
{
return $this->_label;
}
public function setLabel($value)
{
$this->_label = $value;
}
Property names are case-insensitive.
A property can be accessed like a member variable of an object. Reading or writing a property will cause the invocation of the corresponding getter or setter method. For example,
// equivalent to $label = $object->getLabel();
$label = $object->label;
// equivalent to $object->setLabel('abc');
$object->label = 'abc';
If a property has only a getter method and has no setter method, it is considered as read-only. In this case, trying to modify the property value will cause an exception.
One can call hasProperty, canGetProperty and/or canSetProperty to check the existence of a property.
Besides the property feature, the Object class defines a static method create which provides a convenient alternative way of creating a new object instance.
The Object class also defines the evaluateExpression method so that a PHP expression or callback can be dynamically evaluated within the context of an object.