Notice: Undefined variable: conn

undefined variable in php mysql
undefined variable: con in php
undefined variable: query
undefined variable query_run
undefined variable: mysqli
undefined variable: sql
undefined variable insert into
message undefined variable: date

When I do my DB connection like this:

$conn = new MySQLi(RUBYDBUSER, RUBYDBNAME, RUBYDBPASS, RUBYDBDATA);
if($conn->errno) {
    throw new Exception($conn->connect_error, $conn->connect_errno);
}

and I want to run a prepared statement like this:

public function getSitename() {
            $stmt = $conn->prepare("SELECT value FROM cms_options WHERE title = 'sitename' ");
            $db->stmt_init();
            $stmt->execute();
            $stmt->bind_result($sitename);
            if($stmt->num_rows > 0) {
                while ($stmt->fetch) {
                    return $sitename;
                }
            }
        }

I get this error:

Notice: Undefined variable: conn in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 26

The query is in class.core.php and the connection in global.php. The Class.core is included like this:

(global.php)

foreach(glob(RUBY_BASE . '/app/includes/classes/class.*.php') as $class){
    include_once($class);
}

Any answers? `

The variable $conn is not in scope for your class methods. You need do one of the following :

A.) pass the $conn variable into the method you want to call.

 public function getSitename($conn) {
        $stmt = $conn->prepare("SELECT value FROM cms_options WHERE title = 'sitename' ");
        $db->stmt_init();
         //and so on...
}

B.) Establish the connection inside each method (not good choice because you're not reusing an established connection)

C.) Make the connection variable global with a static definition. Could be set in the constructor of the class for example:

   public function __construct($conn) {
       if(empty(static::$conn) {
           static::$conn = $conn;
       }
   }

   public function getSitename() {
       $stmt = static::$conn->prepare("SELECT value FROM cms_options WHERE title = 'sitename' ");
        //... and so on

There are many other variations like these, but they are the general approaches

Undefined variable: $conn. php [SOLVED], Hi,. it happens because of the variable scope, $conn is defined outside the function, so or you pass it as parameter, or you set it as global,� Notice: Undefined variable: conn in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 26 The query is in class.core.php and the connection in global.php . The Class.core is included like this:

This due to variable scope, $conn is defined outside the function, so or you pass it as parameter, or you set it as global, or you use an anonymous function.

$getSitename = function() use($conn) {
            $stmt = $conn->prepare("SELECT value FROM cms_options WHERE title = 'sitename' ");
            $db->stmt_init();
            $stmt->execute();
            $stmt->bind_result($sitename);
            if($stmt->num_rows > 0) {
                while ($stmt->fetch) {
                    return $sitename;
                }
            }
}
// Uses
$getSitename();

Notice: Undefined variable: conn in C:\xampp\htdocs\photogallery , Notice: Undefined variable: conn in C:\xampp\htdocs\photogallery\inc\register- form.php on line 52. Warning: mysqli_query() expects parameter� Well, no, you’re not close to finishing it if you’re getting this many undefined variable errors. print_r, as i advised you to do, prints out an array.For debugging purposes, I told you to

If $conn is initialized in the same file or in any other file and is included in the file which defines the getSitename() function, then you can mark the $conn variable as gloabl inside the function and it will work.

public function getSitename() {

            global $conn; 

            $stmt = $conn->prepare("SELECT value FROM cms_options WHERE title = 'sitename' ");
            $db->stmt_init();
            $stmt->execute();
            $stmt->bind_result($sitename);
            if($stmt->num_rows > 0) {
                while ($stmt->fetch) {
                    return $sitename;
                }
            }
        } 

Undefined variable: conn in [duplicate], And now its not working here in my job. i'm getting this erro Notice: Undefined variable: conn in C:\xampp\htdocs\cef\login_sys.php on line 10 Fatal error: Call� Notice: Undefined variable: conn en C:\xampp\htdocs\ruby\app\includes\classes\class.core.php en la línea 26 La consulta es en class.core.php y la conexión en global.php . La Clase.núcleo se incluye como este:

Php/mysql database connection problem - PHP, Notice: Undefined variable: conn in C:\wamp\www\functions.php on line 164. Warning: mysql_select_db() expects parameter 2 to be resource,� I have 2 issues happening, first one I need to get resolved is, line 60 is giving me a 'Notice: Undefined variable: delete'. This codes had multi issues but was able to resolve all but this one and my table not filling in with the data from my database.

PHP - How to fix Notice: Undefined variable?, There is a suspicion that the challenge "a second time" occurs in some other script where the variable $conn is undefined, due to the fact that it� This question already has an answer here: PHP: “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” 24 answers

php, hi these 2 errors when trying post database. notice: undefined variable: conn in c :\xampp\htdocs\phptuts\sandbox\blog\admin\index.php on line� Why can't your body handle a punch to the liver? - Human Anatomy | Kenhub - Duration: 6:10. Kenhub - Learn Human Anatomy Recommended for you

Comments
  • Are you requiring? i'm not sure about include, but require_once also make sure if you declare on the same file, use the global keyword so that PHP knows it's a variable that already exists, and not one within the scope of the function.
  • First solution gives me Welkom op Warning: Missing argument 1 for Core::getSitename(), called in C:\xampp\htdocs\ruby\app\themes\default\index.php on line 118 and defined in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 25
  • Second solution = bad idea. Third idea gies me this: Warning: Missing argument 1 for Core::__construct(), called in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 42 and defined in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 8 Fatal error: Access to undeclared static property: Core::$conn in C:\xampp\htdocs\ruby\app\includes\classes\class.core.php on line 10
  • @LisaW you have to alter your calls to the various function to pass in the $conn variable. Either when you do a new YourThing($conn) if you use the constructor (example C.) or when you call the method $object->getSiteName($conn) (example A)
  • Both of your answers don't work. Thanks for the answers trough
  • Answer A worked for me just now. Thanks a lot. @LisaW, I think you didn't add "$conn" again when calling the function.