什么是OOPS中的函数重载和覆盖，用外行术语解释[重复]

Question

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• What is function overloading and overriding in php? 10 answers

Actually i am new to OOPS concepts and it is hard to understand, and i also read it somewhere that "we do not have overloading in PHP".I am studying this example but it didnt get me somewhere.

<?php
class Toys{
    private $str;
    public function __set($name,$value){
        $this->str[$name] = $value;
    }

    public function __get($name){
        echo "Overloaded Property name = " . $this->str[$name] . "<br/>";
    }

    public function __isset($name){
        if(isset($this->str[$name])){
            echo "Property \$$name is set.<br/>";       
        } else {
            echo "Property \$$name is not set.<br/>";
        }
    }

    public function __unset($name){
        unset($this->str[$name]);
        echo "\$$name is unset <br/>";
    }
}

$objToys = new Toys;

/* setters and getters on dynamic properties */
$objToys->overloaded_property = "new";
echo $objToys->overloaded_property . "

";
/*Operations with dynamic properties values*/

isset($objToys->overloaded_property);
unset($objToys->overloaded_property);
isset($objToys->overloaded_property);
?>

</div>

Answer 1

Method Overriding

Method Overloading

Simple Explanation

Method Overriding is when a method defined in a superclass or interface is re-defined by one of its subclasses, thus modifying/replacing the behavior the superclass provides. The decision to call an implementation or another is dynamically taken at runtime, depending on the object the operation is called from. Notice the signature of the method remains the same when overriding.

Method Overloading is unrelated to polymorphism. It refers to defining different forms of a method (usually by receiving different parameter number or types). It can be seen as static polymorphism. The decision to call an implementation or another is taken at coding time. Notice in this case the signature of the method must change.