function init(){ $this->include_script('client.js'); $this->register_action('plugin.test', array($this, 'test')); }function test($args){ echo("<script>console.log('PHP: " . "js is working" . "');</script>");}
rcmail.http_post('plugin.test');
The problem is your PHP is invalid, echo isn't a function https://www.php.net/manual/en/function.echo.php