PHP Javascript maintenance page -

i used in index.php

<?     include('config.php');     if($site->maintenance > 0){         echo "<script>document.location.href='maintenance'</script>";         exit;     } ?> 

and in config.php after checked database connection

$site = mysql_fetch_object(mysql_query("select * problems")); 

i made table in database , called problems when put value 0, transfers me maintenance. when checked variable $site var_dump($site) outputs:

bool(false) 

and if checked this: var_dump($site->maintenance) outputs:

null 

what have manage maintenance database , when want site work change value?

why using js this? if user js off? use php instead

create table maintenance column maintenance_status, hold boolean value, 0 1... 0 => off, 1 => on, keep single record created once, , later update always...

so later create function

function check_maintenance($connection) { /* call function on every page,                                            pass database connection var                                            function parameter */    $query = mysqli_fetch_array(mysqli_query($connection, "select * tbl_maintenance limit 1"));     /* limit 1 optional if using 1 row told you,        if keeping records of previous maintenance,        you've sort desc , use limit 1 */     if($query['tbl_maintenance'] == '1') { //check boolean value, if it's on redirect       header('location: maintenance.php'); //redirect user maintenance page       exit;    } }