So the issue lies within the code where I try to change what the products are sorted by, the page doesnt load atm, If I comment out the _GET sort code and just change the one and only result variable to sort by e.g. price then that works, thank you!
<?php
require 'functions.php';
?>
<html>
<head>
<link rel="stylesheet" type="text/css" href="stylesheet.css">
</head>
<body>
<center>
<a href="main.php"><img style="position: relative; top:50px" src="logo.png"/></a>
</center>
<hr>
<?php cart(); ?>
<div id="shopping_cart">
<span style="float:left;">Welcome Guest | Total Items: <?php total_items();?> <b style="colour:blue;">| Total: £<?php total_price(); ?></b> <a href="cart.php">Go to Cart: </a></span>
</div>
<div class="menu">
<ul>
<li class="select"><a href="main.php">HOME</a></li>
<li class="select"><a href="cart.php">BASKET </a></li>
<li class="select"><a href="summary.php">OUR WORLD </a></li>
</ul>
<div id="form">
<form method="get" action="results.php" enctype="multipart/form-data">
<input type="text" name="user_query" placeholder="Search a Product"/>
<input type="submit" name="search" value="Search"/>
</form>
</div>
</div>
<br>
<br>
<br>
<select name="menu" id="drop">
<option>-- Select a filter --</option>
<option value="main.php?sort=name">Name A - Z</option>
<option value="main.php?sort=pasc">Price Low-High</option>
<option value="main.php?sort=pdesc">Price High-Low</option>
</select>
<script type="text/javascript">
var sortmenu = document.getElementById( 'menu' );
sortmenu.onchange = function() {
window.open( this.options[ this.selectedIndex ].value, "_self" );
};
</script>
<?php
$con = mysqli_connect(hello);
$query = "SELECT * FROM MrPiece";
#$result = mysqli_query($con, $query);
$ip=getIp();
$result = mysqli_query($con, "SELECT * FROM MrPiece ORDER BY ID ASC");
if(isset($_GET["sort"])){
if($_GET["sort"]=='pasc'){
$result = ($con,"SELECT * FROM MrPiece ORDER BY Price ASC");
}
elseif($_GET["sort"]=='pdesc'){
$result = ($con,"SELECT * FROM MrPiece ORDER BY Price DESC");
}
elseif($_GET["sort"]=='name'){
$result = ($con, "SELECT * FROM MrPiece ORDER BY Name ASC");
}
}
if(mysqli_num_rows($result) > 0) {
while($row = mysqli_fetch_assoc($result)) {
$pro_id = $row['ID'];
$product_name = $row['Name'];
$product_price = $row['Price'];
$product_image = $row['Image'];
echo "<div id='products_box'>";
echo "<div id='single_product'>";
echo "<a href='details.php?pro_id=$pro_id'><img src='$product_image' style='height:250px; width:180px'></a> <br>";
echo "<a href='details.php?pro_id=$pro_id'>$product_name</a><br>";
echo "£ $product_price <br>";
echo "<a href='main.php?add_cart=$pro_id'><button style='float: center;'>Add to cart</button></a>";
echo "</div>";
echo "</div>";
}
}
else {echo "No results";}
mysqli_close($con);
?>
</body>
<html>
