alert in php

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

<?php 
// PHP program to pop an alert 
// message box on the screen 
  
// Display the alert box  
echo '<script>alert("Welcome to Geeks for Geeks")</script>'; 
  
?> 

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

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

javascript:alert('Email enviado com Sucesso!');
javascript:window.location='index.php';