PHP code not run properly?

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PHP

i'm self studying PHP language?

i'm using net beans to run codes?

if i run this code?
Eg:

<?php
echo "<h2>PHP is fun!</h2>";
echo "Hello world!<br>";
?> 

it will display with echo words

and if i run through net beans it will pops up empty page in web browser?

but if i run manually it will works?
but it will show echo word as well?

do i have to change settings in netbeans for that? or any possible solution please