1//Safe as:
2index.html
3number.php
4
5//HTML:
6<html>
7 <head>
8 <title>Home</title>
9 </head>
10 <body>
11 <h1>Phone Number</h1>
12 <?php include('number.php') ?>
13 </body>
14</html>
15
16//PHP:
17<?php
18 echo 4895553268;
19?>
20