Problems calling class function in another class function - php

Question

I am trying to build my own little framework.
Now I am having problems calling class functions into another class function.
Users.php code
class User extends Connection{
public function __construct(Connection $conn, Log $log){
parent::__construct($log);
$this->conn = $conn;
}
public function generatePassword(){
$length = 12;
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$password = '';
for ($i = 0; $i < $length; $i++) {
$password .= $characters[rand(0, strlen($characters) - 1)];
}
return $password;
}
public function generateToken(){
$token = md5(uniqid(mt_rand(), true));
return $token;
}
public function checkUsername($prefix, $username){
echo "test";
}
}
$user = new User($conn, $log);
$conn = new Connection($log);
connection.php code
<?php
class Connection{
private $log;
private $db;
public function __construct(Log $log){
$this->log = $log;
$this->createConnection();
}
public function createConnection(){
$dataConnection = $this->getConnection();
$host = $dataConnection['localhost'];
$dbname = $dataConnection['dbname'];
$user = $dataConnection['user'];
$pass = $dataConnection['pass'];
try{
$this->db = new PDO('mysql:host='.$host.';dbname='.$dbname.'',$user,$pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->log->insertLog("installer","Trying to connect to database");
} catch(PDOException $e){
$this->errorHandling($e->getCode());
}
}
public function errorHandling($error){
switch ($error){
case 2002:
$this->log->insertLog("installer","Installer error code 2002: Host unknown");
return ('Host unkown');
break;
case 1049:
$this->log->insertLog("installer","Installer error code 1049: Database does not exist");
return ('Database does not exist');
break;
case 1045:
$this->log->insertLog("installer","Installer error code 1045: Could not connect to database");
return ('Could nog connect to database');
break;
}
}
public function getConnection(){
$xml = simplexml_load_file("config/config.xml");
$dataConnection = array();
$dataConnection['localhost'] = $xml->host;
$dataConnection['dbname'] = $xml->dbname;
$dataConnection['user'] = $xml->user;
$dataConnection['pass'] = $xml->pass;
return $dataConnection;
}
public function query($sql){
try {
$this->db->exec($sql);
} catch(PDOException $e) {
$this->errorHandling($e->getCode());
}
}
public function select($sql){
try{
$result = $this->db->prepare($sql);
$result->execute();
return $result->fetchAll();
} catch(PDOException $e){
$this->errorHandling($e->getCode());
}
}
}
$conn = new Connection($log);
$log = new Log();
Log.php code
<?php
class Log{
public function createLog($file){
$date = date("dmY");
$location = 'var/log/'.$file.'-'.$date.'.log';
if (!file_exists($location)){
$file = fopen($location, 'w');
$message = "/** LOG FILE CREATED **/\n";
file_put_contents($location,$message, FILE_APPEND);
fclose($file);
}
return $location;
}
public function insertLog($file,$message){
$date = date("d-m-Y H:i:s", time());
$location = $this->createLog($file);
$message = $date." - ".$message."\n";
file_put_contents($location, $message, FILE_APPEND);
}
}
$log = new Log();
Now when I am trying to call the function checkUsername on user.php (will be used to check if the username already exists in db) I get the error:
Notice: Undefined variable: log in
/opt/www/decocka2/web/www.anthonydecock.be/core/conn/connection.php on
line 77
Catchable fatal error: Argument 1 passed to Connection::__construct()
must be an instance of Log, null given, called in
/opt/www/decocka2/web/www.anthonydecock.be/core/conn/connection.php on
line 77 and defined in
/opt/www/decocka2/web/www.anthonydecock.be/core/conn/connection.php on
line 7
What am I doing wrong?

Answer 1

Try to create the connection and the log object before the user object.