如何从PHP中的另一个文件替换方法值？

Question

I have a class in fileA.php like so:

class Test {
    private foo;

    public function array() {
        $this->$foo = array ( 'a', 'b', 'c', 'd', 'e' );
        return $foo;
    }
}

I want to change the array returned by the method to:

array('x', 'y', 'z')

Not sure if this the right way to about it, but this is what I tried in fileB.php:

require_once('fileA.php');

class TestB extends Test {    
     public function array() {
        $this->$foo = array('x', 'y', 'z');
        return $foo;
     }
 }

Is it possible to make this modification? Any help will be greatly appreciated.

Thanks

Answer 1

$foo is a private property so you cannot access it from any child classes. Only protected and public properties can be accessed from child classes.

Since array() is a public method, you can overwrite that method and return a different array without modifying or accessing $foo.

class TestB extends Test {    
     public function array() {
        return array('x', 'y', 'z');
     }
}

But this would not affect foo for any other methods that use it.

Keep in mind, you must access class properties from within methods as $this->name (ex. $this->foo), not $foo or $this->$foo.