Overloading¶
Overloading provides means to dynamically create properties and methods. These dynamic entities are processed via magic methods one can establish in a class for various action types.
Property overloading is based on the magic methods __get, __set, __isset, __unset. Method overloading is based on the magic methods __call, __callStatic. There is no way to check if a overloaded method exist or not, unlike with properties.
Overloading does not apply to class constants.
Operator overloading is not supported in PHP. For example, it is not possible to define a - minus operator between two objects. This still exists for +, which applies to integers, floats and arrays. It may also be supported by specific PHP extensions.
<?php
class X {
function foo() {
echo __METHOD__;
}
function __call($name, $args) {
echo self::class. '::'. $name;
}
}
$x = new X;
$x->foo(); // x::foo
$x->goo(); // x::goo
// existence check
var_dump(method_exists(x::class, 'foo')); // true
var_dump(method_exists(x::class, 'goo')); // false
var_dump(method_exists(x::class, '__call')); // true
?>
Related : Magic Methods, Dynamic Method, Method Resolution Order (MRO)
