NOTICE: Undefined index: Page - php

Question

I dont understand what im doing wrong, im getting this message:
Notice: Undefined index: page in /Users/prinect/htdocs/sistema-noticias/classes/Article.php on line 221
My code:
public static function getList( $numRows=30, $order="publicationDate DESC" ) {
$conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
$offset = ($_GET['page'] - 1) * $numRows;
$rowCount = 20;
$sql = "SELECT SQL_CALC_FOUND_ROWS *, UNIX_TIMESTAMP(publicationDate) AS publicationDate FROM articles
ORDER BY {$order} LIMIT :offset, :rowCount";
$st = $conn->prepare( $sql );
$st->bindValue( ":rowCount", $rowCount, PDO::PARAM_INT );
$st->bindValue( ":offset", $offset, PDO::PARAM_INT );
$st->execute();
$list = array();
while ( $row = $st->fetch() ) {
$article = new Article( $row );
$list[] = $article;
}
// Now get the total number of articles that matched the criteria
$sql = "SELECT FOUND_ROWS() AS totalRows";
$totalRows = $conn->query( $sql )->fetch();
$conn = null;
return ( array ( "results" => $list, "totalRows" => $totalRows[0] ) );
}

Answer 1

Undefined index means in your case that you are trying to access to an element of an array that does not exist.
It is most likely your $_GET['page']. Do you check if this exists? You should.
For example:
$page = (isset($_GET['page']) ? $_GET['page'] : 1; // 1 is the default page number

Answer 2

you need to check the page if it don't exist because when the page is not in the query param it will be considered as undefined
$page = isset($_GET['page']) ? $_GET['page'] : 1;
$offset = ($page - 1) * $numRows;
$rowCount = 20;