Showing a link with Javascript based on log-in status

It is string escape problem with PHP Syntax

Correct Code: 

<?php
if ( is_user_logged_in() ) {
echo '';
} else {
echo '<a onclick="ppOpen(\'#login_panel\', \'800\',1)" href="https://wordpress.stackexchange.com/questions/155957/javascript:void(0)">Entrar</a>';
}
?>

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