how to display a warning message based on display in php code example

Example 1: alert in php

echo '<script>alert("Message")</script>';

Example 2: php pop up message

Copy Code<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript Alert Box by PHP</title>
<script type="text/javascript">  function openulr(newurl) {  if (confirm("Are you sure you want to open new URL")) {    document.location = newurl;  }}</script></head>
<body>
<strong><a href="javascript:openulr('newurl.html');">Open new URL</a></strong>
</body>
</html>

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Php Example