framework/rbac/PhpManager.php
protected function saveToFile($data, $file)
    {
        file_put_contents($file, "<?php\nreturn " . VarDumper::export($data) . ";\n", LOCK_EX);
        $this->invalidateScriptCache($file);
    }
protected function saveToFile($data, $file)
    {
        file_put_contents($file, "<?php\nreturn " . VarDumper::export($data) . ";\n", LOCK_EX);
        $this->invalidateScriptCache($file);
    }
Saves the authorization data to a PHP script file.

@param array $data the authorization data
@param string $file the file path.
@see loadFromFile()