Conditional On custom field plugin metabox

This can’t work because isset() returns true if there is a value, trueand false are values, ergo it won’t work. Do it like this instead:

$premium = get_field('premium');
if ( ! $premium ) { // this is basically short for $premium == false
    echo 'not premium';
}

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