PHP Script is not working with HTML


i Have included below code in one of BSP pages, HTML code is working fine, however PHP scripting is not been recognized...

please suggest what could be the reason, is my current server does not support PHP processing.



<h1>This is heading 1</h1>


$myString = "Hello!";
echo $myString;
echo "<h5>I love using PHP!</h5>";


output is 'This is heading 1' but Hello or i love using PHP is not coming?? no idea why?

this is being executed on EHP5 SAP