refactor extract boolean expression example (PHP)

from.php

<?php
class MobilePhone {
    // example state
    $state = [
        'connectedToWifi' => true,
        'connectedToCelular' => false,
    ];

    public function isOnlineMsg() {
        if($this->state['connectedToWifi'] || $this->state['cellular']) return 'yes';
        return 'no';
    }
}

to.php

<?php
class MobilePhone {
    // example state
    $state = [
        'connectedToWifi' => true,
        'connectedToCelular' => false,
    ];

    public function isOnline() {
        return $this->state['connectedToWifi'] || $this->state['cellular'];
    }

    public function isOnlineMsg() {
        if($this->isOnline()) return 'yes';
        return 'no';
    }
}