Receiving the following error message: Fatal error: Uncaught Error: Call to undefined function mysqli$()$ in C:$\backslash$wamp$64\backslash$www$\backslash$hci$\backslash$show$\_$DBItems.php on line $30$

$\text{'}$;

$//$ Create connection

$conn $=$ new mysqli$($$servername, $username, $password, $dbname$)$;

$//$ Check connection

if $($$conn$->$connect$\_$error$)\{$

die$("$Connection failed: $".$ $conn$->$connect$\_$error$)$;

$\}$

$//$Form for inserted data

if $($$$\_$SERVER$["$REQUEST$\_$METHOD"$]==$ "POST"$)\{$

$description $=$ $$\_$POST$[\text{'}$description$\text{'}]$;

$price $=$ $$\_$POST$[\text{'}$price$\text{'}]$;

$cost $=$ $$\_$POST$[\text{'}$cost$\text{'}]$;

$quantity $=$ $$\_$POST$[\text{'}$quantity$\text{'}]$;

$//$Insert data

$sql $=$ "INSERT INTO items $($item$\_$description, item$\_$cost$,$ item$\_$price, item$\_$quantity$)$

VALUES $(\text{'}$$description', $\text{'}$$cost$\text{'},\text{'}$$price', $\text{'}$$quantity'$)"$;

if $($$conn$->$query$($$sql$)===$ TRUE$)\{$

echo "Item Added Successfully" $."$

$"$;

$\}$ else $\{$

echo "Error: $".$ $sql $."$

$".$ $conn$->$error;

$\}$

$\}$

$//$query database

$result $=$ $conn$->$query$("$select $*$ from items"$)$;

$//$display the result

if $($$result$->$num$\_$rows $>0)\{$

$//$ output data of each row

while$($$row $=$ $result$->$fetch$\_$assoc$())\{$

echo "Item Description: $".$ $row$["$item$\_$description"$]."$

$".$

"Item Cost: $".$ $row$["$item$\_$cost$"]."$

$".$

"Item Price: $".$ $row$["$item$\_$price"$]."$

$".$

"Quantity: $".$ $row$["$item$\_$quantity"$]."$

$".$

"Item Number: $".$ $row$["$item$\_$number"$]."$

$".$

"Added Time: $".$ $row$["$added$\_$time"$]."$

$"$ ;

$\}$

$\}$ else $\{$

echo $"0$ results";

$\}$

$sql $=$ "CREATE TABLE items $($

item$\_$description VARCHAR$(100)$ NOT NULL,

item$\_$cost INT$(6)$ NOT NULL,

item$\_$price$(10)$ NOT NULL,

item$\_$quantity$(6)$ NOT NULL,

added$\_$time TIMESTAMP DEFAULT CURRENT$\_$TIMESTAMP ON UPDATE

CURRENT$\_$TIMESTAMP

$)"$;

echo "Connected successfully";

$conn$->$close$()$; $//$ close connection

$?>$