php - Login button not disappearing after login -

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i have began learn php , i'm working on facebook app @ moment. problem facing login button remains on screen after user has accessed account. have explination this? here code:

<?php if (isset($user_profile)) {   ?>          user logged in <?php }  else { ?>    <div class="fb-login-button" data-scope="email"></div>  <?php } ?>

i included file $user_profile defined $user_profile = $facebook->api('/me');

test output of $user_profile using var_dump( $user_profile ) command. add exit command after var_dump pause execution. code sample else block being run meaning there issue $user_profile variable.


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