how to alert a message in php code example

Example 1: alert in php

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

Example 2: show alert in php

echo '<script language="javascript">alert("juas");</script>';

Example 3: alert in php

// This is in the PHP file and sends a Javascript alert to the client
$message = "Something";
echo "<script type='text/javascript'>alert('$message');</script>";