[howto] php autoload virtual model

class model_test1 {
    public static function __callStatic($name, $args) {
        echo 'Hello from '.__CLASS__.'::'.__FUNCTION__.PHP_EOL;
    }
    public function __call($name, $args) {
        echo 'Hello from '.__CLASS__.'->'.__FUNCTION__.PHP_EOL;
    }
}

spl_autoload_register(function ($class) {
    if (class_exists($class)) {
        return true;
    }
    $try_model = 'model_'.$class;
    if (class_exists($try_model)) {
        eval('class '.$class.' extends '.$try_model.'{};');
        return true;
    }
});

// Existing class call
$ts = microtime();

model_test1::hello();
$model_test1 = new model_test1();
$model_test1->hello();

echo round(microtime() - $ts, 5).PHP_EOL;

// Virtual class call
$ts = microtime();

test1::hello();
$test1 = new test1();
$test1->hello();

echo round(microtime() - $ts, 5).PHP_EOL;

https://github.com/yfix/yf/blob/master/.dev/samples/autoload_virtual_model.php