WHERE alias !== $page_alias
replace with
WHERE alias != $page_alias
But in general it is not entirely clear what you want to get the first request?
if a match then the condition should be like this
if (!($result = mysqli_query($db, "SELECT alias FROM env8g_content WHERE alias = $page_alias"))) { $query = "INSERT INTO env8g_content (title,alias,introtext,state,sectionid,catid,created,created_by,publish_up) values ($page_title,$page_alias,$page_edit,'1','0','9',$page_date,'982',$page_date)"; mysqli_query($db, $query); }
in general, put a unique index on the alias field, and MySQL itself will check for the uniqueness of the field, and if you throw an error, you only need to process it
By the way, an insertion with an IGNORE directive or ON DUPLICATE KEY UPDATE will help you, depending on the application logic. Look here