Fatal error: Uncaught Error: Call to undefined function ClassesConnectionmysqli_connect() in C:Apache24htdocsControlePMClassesConnectionDBConnect.php:21 Stack trace: #0 C:Apache24htdocsControlePMindex.php(22): ClassesConnectionDBConnect->connect() #1 {main} thrown in C:Apache24htdocsControlePMClassesConnectionDBConnect.php on line 21

<?php
    namespace ClassesConnection;
    class DBConnect
    {
    var $host;
    var $username;
    var $password;
    var $database;
    public $dbc;
    public $connInfo=FALSE;

    public function __construct(){
        $this->host = 'localhost:3306';
        $this->username = 'root';
        $this->password = 'MyPassWord';
        $this->database = 'MyDB';
    }
    public function connect()
    {
        $conn = mysqli_connect($this->host,$this->username,$this->password,$this->database);

    if (! $conn) {
        echo "Error: Unable to connect to MySQL." . PHP_EOL;
        echo "Debugging errno: " . mysqli_connect_errno() . PHP_EOL;
        echo "Debugging error: " . mysqli_connect_error() . PHP_EOL;
        exit;
    }
    echo "Success: A proper connection to MySQL was made! The my_db database is great." . PHP_EOL;
    echo "Host information: " . mysqli_get_host_info($link) . PHP_EOL;
    mysqli_close($conn);
    }
?>

<?php
require_once ('Classes/Connection/DBConnect.php');
$conn = new DBConnect();
$conn->connect();

if (! $conn->connInfo){
    $result = "Connection failed";
}
else $result = "Connection Succes";
?>