如何在PHP的子类中访问父方法？

Question

In PHP, how do I access a parent method from within a child class? The method I want to access is an instance method too. I have tried accessing with $this but of course that refers to the class I'm currently in. I don't want to have to duplicate code and don't want to access it statically.

Parent class:

    protected function getSearchTerm(){
    return $this->searchTerm;
}

Child class:

protected function getSearchTerm(){ return parent::getSearchTerm(); }

Answer 1

To call a method from the parent-class within a child-class, you can use parent :

class Base
{
    function somefunc()
    {
        echo "hello";
    }
}
class Derived extends Base
{
    function call_somefunc()
    {
        parent::somefunc();
    }
}

$class = new Derived;
$class->call_somefunc(); //prints "hello"

This does work for different instances, meaning that parent::somefunc() calls the method in the parent class of a specific instance of Derived . So basically:

class Base
{
    function somefunc($id)
    {
        echo 'hello ' . $id . "<br />\n";
    }
}
class Derived extends Base
{
    public $id;
    function __construct($id)
    {
        $this->id = $id;
    }
    function call_somefunc()
    {
        parent::somefunc($this->id);
    }
}
$class1 = new Derived(1);
$class2 = new Derived(2);
$class1->call_somefunc(); //prints: hello 1
$class2->call_somefunc(); //prints: hello 2