Admin page changes the $_POST data

I’ve found the function wp_unslash, from wp core.

$value = wp_unslash($_POST['theme_faq']);
if ($faq !== value ) {
    $faq = value ;
    update_option('theme_faq', $faq);
}

and now it works fine.

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