Convert Data from MySQL to JSON using PHP

I am trying to convert data from my DB to JSON with a PHP script. Everything works great on my local environment (MAMP). As soon as I am trying to put things together on my server, my JSON File is empty :(

What I have so far

my php script

<?php

$connection = mysqli_connect("localhost","root","root","angulardb") or die("Error " . mysqli_error($connection));

$sql = "select * from postings"; $result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));

$emparray = array();
while($row =mysqli_fetch_assoc($result))
{
    $emparray[] = $row;

}

$fp = fopen('menue.json', 'w'); fwrite($fp, json_encode($emparray)); fclose($fp);

echo json_encode($emparray);

?>

By uploading this script to my server (& update the data), I receive an empty JSON file with no response.

Any Idea what can be wrong??? Is there additional configuration necessary on the server side?

Thanks in advance