PHP mysqli_fetch_all gives me a blank screen

Question

I just pushed something from my local machine to the live site and I get blank pages everywhere. I tracked down the problem to mysqli_fetch_all when I use that everything breaks

Answer 1

The function mysqli_fetch_all() and its object oriented counterpart (mysqli_result::fetch_all) are only available in PHP 5.3 and later.

It appears your server is running a lower version of PHP, or you're missing MySQL Native Driver (which this function depends on), which explains why the other fetch functions work and this doesn't.

From the Manual:

mysqli_fetch_all
mysqli_result::fetch_all
(PHP 5 >= 5.3.0)

For future debugging, turn errors on or refer to your error log because this will usually help to identify the problem.

error_reporting(E_ALL);
ini_set('display_errors', '1');

If you don't have access to upgrade the PHP version, or install MySQLND, you can simply convert the code to manually iterate using mysqli_fetch_assoc():

function getUserFields($connection){
    $query = mysqli_query($connection, "DESCRIBE `adminUsers`");    
    $results = array();

    if($query){
        while($row = mysqli_fetch_assoc($query)){
            $results[] = $row;
        }
    }

    return $results;
}