i'm having an issue with this piece of code and i cant see where the problem .
<?php
require_once("config.php");
class MySQLDatabase{
private $connection;
function _construct(){
$this->open_connection();
}
public function open_connection(){
$this->connection=mysqli_connect(DB_SERVER,DB_USER,DB_PASS,DB_NAME);
if(!$this->connection){
Die("Database Connection Problem : ".mysqli_connect_errno()." : ".mysqli_connect_error());
}
}
public function close_connection(){
if(isset($this->connection)){
mysqli_close($this->connection);
unset($this->connection);
}
}
public function query($sql){
$sql=mysql_prep($sql);
$result=mysqli_query($this->connection,$sql);
confirm_query($result,$sql);
return $result;
}
public function mysqli_prep($string){
global $connection;
$safe_string=mysqli_real_escape_string($this->connection,$string);
return $safe_string;
}
private function confirm_query($result,$sql){
if(!$result){
Die("Database query Problem : ".$sql);
}
}
}
$database=new MySQLDatabase();
$db=& $database;
?>
And i try to run the code bellow on Index.php
<?php
require_once("../includes/database.php");
echo "Is this working?";
echo $database->mysqli_prep("sss");
?>
But I receive this Error
Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli, null given in \\includes\\database.php on line 29
The error is saying that the $this->connection
you use in MySQLDatabase::mysqli_prep()
is null
. That's because it was never initialized.
Your class constructor needs to start with two underscores instead of one:
function __construct(){
$this->open_connection();
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.