Question

I need to pass variables found in parent class to the extended class, but all i get is a notice that the variables are undefined.

I am not sure what is wrong and my gut says that this is an easy fix, but for some reason i can not see it.

<?php
class trackem {

public $hostnm;
public $ip;
public $info;

public function __construct() {
}

public function getNm($hostnm){
    $hostnm = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    //echo $hostnm;
}
public function getIp($ip){
    $ip =  $_SERVER['SERVER_ADDR'];
    //echo $ip;
}
public function getBrws($info){
    $info = get_browser(null, true);
    //print_r($info);
}

}

class trackem2file extends trackem{

function wrtInfo(){
    //parent::getBrws($info);
    //parent::getIp($ip);
    //parent::getNm($hostnm);
    parent::__construct();

    $this->hostnm = parent::getNm($hostnm);
    $this->ip = parent::getIp($ip);
    $this->info = parent::getBrws($info);
    $this->filename = 'txt/trackfile.txt';

    $this->fh = fopen($this->filename, 'w');
    fwrite($this->fh, $this->hostnm . '\r\n');
    fwrite($this->fh, $this->ip . '\r\n');
    fwrite($this->fh, $this->info . '\r\n');
    fwrite($this->fh, '--------------------' . '\r\n');
    fclose($this->fh);

}
}

$track2 = new trackem2file();
$track2->wrtInfo();
?>

I have tried to find a solution to this for about 2 days now, and I have read some other posts about object inheritance and variables not being loaded to extended classes but was not helpful enough to help me solve this problem. So I now ask for your help.

Thanks in advance.

Answer 1

You need to use them like this, you missed out the $this->:

$this->info;
$this->ip;
$this->hostnm;

Try this:

<?php
class trackem
{
    public $hostnm;
    public $ip;
    public $info;

    public function __construct()
    {
    }

    public function getNm()
    {
        $this->hostnm = gethostbyaddr($_SERVER['REMOTE_ADDR']);
    }
    public function getIp()
    {
        $this->ip = $_SERVER['SERVER_ADDR'];
    }
    public function getBrws()
    {
        $this->info = get_browser(null, true);
    }

}

class trackem2file extends trackem
{
    function wrtInfo()
    {
        parent::__construct();

        $this->getNm();
        $this->getIp();
        $this->getBrws();
        $filename = 'txt/trackfile.txt';

        $fh = fopen($filename, 'w');
        fwrite($fh, $this->hostnm . '\r\n');
        fwrite($fh, $this->ip . '\r\n');
        fwrite($fh, $this->info . '\r\n');
        fwrite($fh, '--------------------' . '\r\n');
        fclose($fh);

    }
}

$track2 = new trackem2file();
$track2->wrtInfo();
?>