PHP - Tratando de solucionar el problema del Callback en la carga de Google Maps API

$url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' . $address . '&key=' . $this->getServerApiKey();

JHtml::script('https://maps.googleapis.com/maps/api/js?key=' . $this->getJsApiKey());

https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=Function.prototype

$url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' . $address . '&key=' . $this->getServerApiKey() . '&callback=Function.prototype';

 JHtml::script('https://maps.googleapis.com/maps/api/js?key=' . $this->getJsApiKey() . '&callback=Function.prototype');

Google Maps JavaScript API warning: NoApiKeys https://developers.google.com/maps/documentation/javascript/error-messages#no-api-keys

Uncaught (in promise) TypeError: k is undefined

pda https://maps.googleapis.com/maps/api/js?key=AQUÍ-MI-API-ACTUAL:207

promise callback*pda/< https://maps.googleapis.com/maps/api/js?key=AQUÍ-MI-API-ACTUAL:207

La llamada a la api la estás haciendo con PHP y no con javascript, por lo que Function.prototype no existe.

Si en defecto estás usando javascript y solo armando la URL con PHP podrías declarar un callback vos mismo en el script

<script>

// ... tu codigo de google

function fakeCallback() {}

</script>

y en la URL: $url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' . $address . '&key=' . $this->getServerApiKey() . '&callback=fakeCallback';

$this->js  = '<script async src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDpJ7_ETC...&callback=initialize"></script>' . "\n";

$this->js  = '<script>function fake() {}</script><script async src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDpJ7_ETC...&callback=fake"></script>' . "\n";

$this->js  = '<script>function fake() {}</script><script async src="https://maps.googleapis.com/maps/api/js?key=AIzaSyDpJ7_ETC...&callback=fake"></script>' . "\n";