where is my error in my php code in connecting to the database

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SQL

PHP

<?php 
$host   =  'localhost';
$user = 'root';
$password = 'root';
$database  =  's5_db';
$port   =   '8889';
$socket = '/Applications/MAMP/tmp/mysql/mysql.sock';





$conn  = mysqli_connect($host, $user, $password, $database, $port, $socket);

 if (!$conn) {
     
     die("failed connection : ". mysqli_connect_error());
 } else {
     echo "connection pass : ";
}

after testing the code it shows connection pass but after i run the following code on another script
which follows :


$test = mysqli_query($conn);



if(!$test){
echo 'conn has an error';
} else {
echo 'conn is okay no errors ';
}

it returns conn has an error
please point to me my error