从静态方法调用非静态方法

Question

I think it is very basic functionality, please help. How can I call non-static method into static-method in php.

class Country {
    public function getCountries() {
        return 'countries';
    }

    public static function countriesDropdown() {
        $this->getCountries();
    }
}

Answer 1

Preferred way..

It is better to make the getCountries() method static instead.

<?php

class Country {
    public static function getCountries() {
        return 'countries';
    }

    public static function countriesDropdown() {
        return self::getCountries();
    }
}
$c = new Country();
echo $c::countriesDropdown(); //"prints" countries

---

Adding a self keyword displays the PHP Strict Standards Notice To avoid that you can create an object instance of the very same class and call the method associated with it.

Calling a non-static method from a static method

<?php

class Country {
    public function getCountries() {
        return 'countries';
    }

    public static function countriesDropdown() {
        $c = new Country();
        return $c->getCountries();
    }
}

$c = new Country();
echo $c::countriesDropdown(); //"prints" countries

Answer 2

You even use Class Name

public static function countriesDropdown() {
    echo Country::getCountries();
}

Answer 3

You cannot straight forward do that for that you need create a instance of the class & have to call the non-static method,

class Country {
    public function getCountries() {
        return 'countries';
    }

    public static function countriesDropdown() {
        $country = new Country();
        return $country->getCountries();
    }
}

DEMO .