$sites = array("site1.com", "site2.com", ... , "site500.com");
$themeName = "your_theme_name";
$sshUser = "kullanici_adi";
$sshPass = "sifre";
$mysqlUser = "veritabani_kullanici_adi";
$mysqlPass = "veritabani_sifre";
$mysqlHost = "veritabani_sunucu";
$mysqlDb = "veritabani_adi";
foreach ($sites as $site) {
    echo "Site: $site\n";
    $sshCommand = "sshpass -p'$sshPass' ssh -t $sshUser@$site \"cd /var/www/html/wordpress-dizini/; wget URL_TEMA_DOSYASI; tar -zxvf INDIRILEN_DOSYA.tar.gz\"";
    exec($sshCommand);
    $mysqlCommand = "sshpass -p'$sshPass' ssh $sshUser@$site \"mysql -u$mysqlUser -h$mysqlHost -p$mysqlPass -e 'USE $mysqlDb; UPDATE wp_options SET option_value=\\'$themeName\\' WHERE option_name=\\'template\\'; UPDATE wp_options SET option_value=\\'$themeName\\' WHERE option_name=\\'stylesheet\\';'\"";
    exec($mysqlCommand);
    
}