PHP嵌入在Javascript中

// JavaScript
function loadData() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "your_php_script.php", true);
  xhttp.send();
}

// PHP (Twig)
<div>
  <h1>{{ title }}</h1>
 <script>
    var title = "{{ title }}";
  </script>
</div>

// PHP
$data = array("name" => "John", "age" => 30);
echo json_encode($data);

// JavaScript
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    var data = JSON.parse(this.responseText);
    document.getElementById("demo").innerHTML = "Name: " + data.name + ", Age: " + data.age;
  }
};
xhttp.open("GET", "your_php_script.php", true);
xhttp.send();