php page doesn't rendering when connect to database - php

Question

I'm making simple php web page, using php5, mysql, Nginx.
when connect to database, it suddenly freeze, and render nothing to browser..
my php code is this.
<?php
$host = 'localhost';
$user = 'root';
$password = '123456';
$db_name = 'test';
$link = new mysqli($host, $user, $password, $db_name);
if($link->connect_errno) {
echo "<script>alert('Connection Error....')</script>";
}
if($link) {
echo "<script>alert('Successfully connected!');</script>";
}
?>
(lib/connect_db.php)
<?php
include './lib/connect_db.php';
$create_user_query = 'CREATE TABLE ...';
$admin_user_query = 'INSERT INTO ....';
$create_widget_query = 'CREATE TABLE ...';
if($link->query($create_user_query) === TRUE) {
echo "<script>alert('Success!')</script>";
}
$link->close();
?>
(init.php)
index.php also include './lib/connect_db.php', it is OK. but init.php always causing problem.
p.s. when I edited init.php to
<script>alert('...');</script>
<?php
...
?>
it doesn't call alert();

Answer 1

you have syntax error you missing $ before variable in (lib/connect_db.php)
include '.lib/connect_db.php';
$create_user_query = 'CREATE TABLE ...';
$admin_user_query = 'INSERT INTO ....';
$create_widget_query = 'CREATE TABLE ...';
if($link->query($create_user_query) === TRUE) {
echo "<script>alert('Success!')</script>";
}
$link->close();