Insert query in php

<?php
//Database connection in php

$host='localhost';
$username='root';
$password='';
$dbname='myprojectdb';

$conn=mysqli_connect($host,$username,$password,$dbname);

//Insert query in php

$sql="INSERT INTO `member`(`username`,`password`,`name`,`email`,`phone`,`city`,`address`,`date`) VALUES('".trim($_POST['username'])."','".trim($_POST['password'])."','".trim($_POST['name'])."','".trim($_POST['email'])."','".trim($_POST['phone'])."','".trim($_POST['city'])."','".trim($_POST['address'])."','".date('Y-m-d')."')";
$res=mysqli_query($conn,$sql);

?>