using shortcodes in theme content

To put shortcode within a PHP template, use do_shortcode();

<?php
echo do_shortcode( '[like_to_read]The text that is hidden from the user.[/like_to_read]' );
?>

Edit:

 <?php
    echo do_shortcode( '[like_to_read]' . get_the_content() . '[/like_to_read]' );
    ?>

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)