PHP error: Notice: Undefined offset

Ranjank Published at Dev

Ranjank

i have created an api to fetch data from database to echo it as json and finally display it in html but while echoing the data,

i am getting below php errors

Notice: Undefined offset: 80 in /opt/lampp/htdocs/ReadExchange/api.php on line 16

Notice: Undefined offset: 79 in /opt/lampp/htdocs/ReadExchange/api.php on line 16

Notice: Undefined offset: 78 in /opt/lampp/htdocs/ReadExchange/api.php on line 16

and so on,

PHP Code

$db_result_set = $db->prepare('SELECT p.Id, p.FirstName, p.MiddleName, p.LastName, p.Gender, p.Location, p.Email, p.Mobile,b.BookTitle, b.BookGenre, b.BookWriter, b.BookDescription FROM personaldetails AS p LEFT JOIN bookdetails AS b ON b.UserId = p.Id ORDER BY p.Id DESC');;

$db_result_set->execute();

$final = [];
foreach ($db_result_set as $u) {

    if (!is_array($final[$u["Id"]])) {   //line 16 
        $final[$u["Id"]]= [
            "Id" => $u["Id"],
            "FirstName" => $u["FirstName"],
            "MiddleName" => $u["MiddleName"],
            "LastName" => $u["LastName"],
            "Gender" => $u["Gender"],
            "Location" => $u["Location"],
            "Email" => $u["Email"],
            "Mobile" => $u["Mobile"],
         ];
    }
    $final[$u["Id"]]["books"][] = [
        "BookTitle" => $u["BookTitle"],
        "BookGenre" => $u["BookGenre"],
        "BookWriter" => $u["BookWriter"],
        "BookDescription" => $u["BookDescription"],
    ];

}   
    
    header('Content-type: application/javascript');
    echo json_encode($final);

i am not confirm but i think because of this i am not getting json data in html.

nospor

Not: if (!is_array($final[$u["Id"]]))

but: if (!isset($final[$u["Id"]]))

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