Create subdomains for php

Create subdomains for php is possible?

I try but the page is blank or generates error message IPv4/IPv6 address

// http://www.linode.com/api/

// Create a domain record
$api_key = "MY_API";
$domain_id = 9485;
$subdomain = $_GET['subdomain'];

$json_url = 'https://api.linode.com/?api_key=' .
        $api_key . 
        '&api_action=batch&api_requestArray=[{' .
        '"api_action": "domain.resource.create",' .
        '"domainid": ' . $domain_id . ', ' .
        '"Name": "' . $subdomain . '", "Type":"A", "TTL_sec":0' .
        '}]';

$json_file = file_get_contents($json_url,0,null,null);
$data = json_decode($json_file, true);
print_r($data);

Even if I can, I'll have to run a script to enable the new site created, where do not know if exec () you can run it on apache …

Look:

A friend gave me a script to adapt but do not know in which directory to let these scripts. He did not specify that.

#!/usr/bin/php
readName()
              ->readPath()
              ->create();
        break;

    case 'deletar':
        $vhost->readName()
              ->delete();
        break;

    default:
        die("\n" . 'Erro: Ação inválida!' . "\n\n");
}

vhost.php

name;
    }

    public function readName()
    {
        $this->name = readline("\n" . 'Digite o nome do VirtualHost: ');

        return $this;
    }

    public function readPath()
    {
        $this->path = readline("\n" . 'Digite o caminho da pasta web do VirtualHost: ');

        if ( ! is_dir($this->path) )
            die ("\n" . 'Erro: O caminho informado não é um diretório válido.' . "\n\n");

        return $this;
    }

    public function create()
    {
        $vhostFile = fopen('/etc/apache2/sites-available/' . $this->name, 'w');
        fwrite($vhostFile, $this->getStructure());

        $this->enable();

        exec('sudo -u username google-chrome http://' . $this->name);

        exit("\n" . 'VirtualHost criado!' . "\n\n");
    }

    private function getStructure()
    {
        return "
 <virtualhost *:80="">DocumentRoot $this->path
ServerName $this->name

# This should be omitted in the production environment
SetEnv APPLICATION_ENV development

<directory $this-="">path>
Options Indexes MultiViews FollowSymLinks
AllowOverride All
Order allow,deny
Allow from all</directory></virtualhost> 
";
    }

    private function enable()
    {
        $hostsFile = fopen('/etc/hosts', 'a');
        fwrite($hostsFile, "\n" . '127.0.0.1 ' . $this->name);

        exec('a2ensite ' . $this->name);
        exec('service apache2 reload');
    }

    public function delete()
    {
        if ( unlink('/etc/apache2/sites-available/' . $this->name) ) {
            $this->disable();
            exit("\n" . 'VirtualHost deletado!' . "\n\n");
        } else
            die("\n" . 'Erro: Este VirtualHost não existe!' . "\n\n");

    }

    private function disable()
    {
        exec('a2dissite ' . $this->name);
        exec('service apache2 reload');
    }

}