[H!nt] : Source Code SQLi Challenge

<?php
/* ABaDy SQLi Challenge Level:VeryEasy */
$sql = new mysqli("localhost", "SQLi", 'HelloWorld', "SQLi");
if(mysqli_connect_errno()) exit("E:".mysqli_connect_error());
if($_GET['id'] and !empty($_GET[id])){
$ID = ($_GET['id']);
$ID = Super_Replace("select","",$ID);
$ID = Super_Replace("and","",$ID);
$ID = Super_Replace("or","",$ID);
$ID = Super_Replace("schema","",$ID);
$ID = Super_Replace('admins',"",$ID);

    $d = $sql->query("SELECT * FROM `news` WHERE id={$ID}");
    if($d->num_rows){
        $new = $d->fetch_array(MYSQLI_ASSOC);
        echo "
        <html>
        <head>
        <title>{$new[sub]}</title>
        </head>
        <body background='https://img.fireden.net/v/image/1510/97/1510977402305.jpg'>
        <b><h2><font color='yellow'>{$new[sub]}</font></h2></b>
        <h3><font color='yellow'>{$new[text]}</font></h3>
        </body>
        </html>";
    }else{
        echo "
        <html>
        <head>
        <title>Error</title>
        </head>
        <body style='background-size: 100%;'  background='https://img.fireden.net/v/image/1510/97/1510977402305.jpg'>
        <b><h2><font color='yellow'>Error SQL Query : {$ID}</font></h2></b>
        </body>
        </html>";
    }
}else{
    echo "
        <html>
        <head>
        <title>Index</title>
        </head>
        <body style='background-size: 100%;' background='https://img.fireden.net/v/image/1510/97/1510977402305.jpg'>
        <b><h2><font color='yellow'>you can check id 1,2,3,4</font></h2></b>
        </body>
        </html>";
}
function Super_Replace($a,$b,$c){
    $a = strtolower($a);
    $d = str_replace($a,$b,$c);
    if(strpos($d,$a)===false){
        return $d;
    }else{
        return Super_Replace($a,$b,$d);
    }
}
?>