public function int someParametricMethod($param1, array $param2, array $param = []) {
    // ...
    return $integerValue;
}

if (!file_exists(__DIR__ . '/di-definition.php')) {
   $compiler = new Zend\Di\Definition\Compiler();
   $compiler->addCodeScannerDirectory(
       new Zend\Code\Scanner\ScannerDirectory('path/to/library/My/')
   );
   $definition = $compiler->compile();
   file_put_contents(
       __DIR__ . '/di-definition.php',
       '<?php return ' . var_export($definition->toArray(), true) . '?>;'
   );
} else {
   $definition = new Zend\Di\Definition\ArrayDefinition(
       include __DIR__
       span style= . '/di-definition.php'
   );
}