我已将网站上载到000webhost.com，但显示此错误：

我使用以下代码连接到数据库：

<?php
error_reporting(E_ALL);
global $connection;
$connection = mysqli_connect("000webhost","course_coordination","1122334455","id5418791_course_coordination");
mysqli_query($connection,"SET character_set_results = 'utf8'");
mysqli_query($connection,"SET character_set_client = 'utf8'");
mysqli_query($connection,"SET character_set_connection = 'utf8'");
mysqli_query($connection,"SET character_set_database = 'utf8'");
mysqli_query($connection,"SET character_set_server = 'utf8'");  
if(!$connection) {
    $err = 'Can Not Connected To Server';
    echo "<div class='alert alert-danger' style='max-width:500px; margin: 4px auto'>";
        echo $err;
    echo "</div>";
} 
?>

我想第四行有个错误。请帮帮我