PHP: problems with inheritance

Question

I try to do class tree where each class in tree check own directory for template and use it, but when I call function in inherited class then called parent. How can i do it ?

My code in example below output:

D
C
b/1.phtml

but i need to d/1.phtml

<?php

class A {
    private $templates_dir = 'a';
}

class B extends A {

    private $templates_dir = 'b';

    public function templates_dir()
    {
        return $this->templates_dir;
    }

    public function check_template($tpl)
    {
        $dir = $this->templates_dir();
        $file = $dir. '/'. $tpl;
        echo (get_class($this)). "\r\n";
        echo (get_parent_class($this)). "\r\n";
        echo $file . "\r\n";
// idea  - if (!file_exists($file)) return parent::check_template($file);
// method call each class while template will be found
// how do it?


    }

}

class C extends B {

    private $templates_dir = 'c';

}

class D extends C {

    private $templates_dir = 'd';

}

$obj = new D();
$obj->check_template('1.phtml');

With all those subclasses you're entering in a world of pain. — Federkun
– Federkun, Commented Jun 4, 2017 at 14:04

Jacob Lambert · Accepted Answer · 2017-06-04 13:59:17Z

1

I would just make $templates_dir protected:

class A {
   protected $templates_dir = 'a';
}

and adjust the extending classes to do the same.

That will then cause templates_dir() to return whatever $templates_dir is set to.

answered Jun 4, 2017 at 13:59

Jacob Lambert

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2 Comments

anry Over a year ago

Thanks, it's solution for templates_dir, but the main idea is redefine template and without redefine function check_template in each child class calling parent:check_template call first parent class where is defined.

anry Over a year ago

I want each class in class tree find template in own templates dir and if there is not template call immediate parent class for check this template in own templates_dir and further until the template is found

mindaJalaj · Accepted Answer · 2017-06-04 14:05:41Z

Another approach will be placing the functions in a abstract class, and each of class A,B,C,D extends this, This is a neater way of doing things.

Below is the code --

    abstract class WW {

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

    public function check_template($tpl)
    {
        $dir = $this->templates_dir();
        $file = $dir. '/'. $tpl;
        echo (get_class($this)). "\r\n";
        echo (get_parent_class($this)). "\r\n";
        echo $file . "\r\n";
    // idea  - if (!file_exists($file)) return parent::check_template($file);
    // method call each class while template will be found
    // how do it?


    }
}

class A extends WW {
    protected $templates_dir = 'a';
}

class B extends WW {

    protected $templates_dir = 'b';



}

class C extends WW {

    protected $templates_dir = 'c';

}

class D extends WW {

    protected $templates_dir = 'd';



}

$obj = new D();
$obj->check_template('1.phtml');

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