reference jqeury with php code example
Example 1: jquery script tag
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
// Put this script in the head of your index.html to load jQuery
// The Google Hosted Libraries is a stable, reliable, high-speed,
// globally available content distribution network for the most popular,
// open-source JavaScript libraries.
// Google works directly with the key stakeholders for each library effort
// and accepts the latest versions as they are released.
Example 2: how to use jQuery
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>jQuery</title>
</head>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script>
//jQuery code
</script>
</body>
</html>