Php OutPut Error !!

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PHP

Hello Coders !

EveryThing Is working Fine In My HTML Template But When I Put Php Code , The OutPut Displayed Like This !

Code :

<div class="box">
                    <h3>Recent Activity</h3>
                    <?php
                    echo "Okk !! ";

                    ?>

                </div>

output is nothing ! i dont know where is the error when i put some tag in echo like
echo "

hello

";

then the output is

Okk !!
"; ?>

Kindly Help me out !