simple example for an implemention of jsonp in php

jsonp_example.php

<?php

$callback = $_GET['callback'];
$json     = json_encode(['foo' => 'bar'], JSON_FORCE_OBJECT);

if ($callback) {
  header('Content-Type: text/javascript');
  echo $callback.'(';
  echo $json;
  echo ');';
  
  // jqueryfunction({"foo":"bar"});
} else {
  header('Content-Type: application/json');
  echo $json;
  
  //{"foo": "bar"}
}