make json array from mysql data using php - php

Question

I want to take some data from my mysql database, and pass it to a json array, so that I can use it in my android application.
But so far I'm having trouble getting any data from the mysql db, when i run my php code in the browser to check output, i get a blank screen. Can someone help ?
CODE:
<?php
$connection = mysqli_connect("localhost","testUser","root","EasyFridge") or die("error". mysqli_error($connection));
$sql = "select * from product";
$result = mysqli_query($connection, $sql);
$emparray = array();
while($row = mysqli_fetch_assoc($result)){
$emparray[] = array("product" => $row);
}
echo json_encode($emparray);
mysqli_close($connection);
?>

Answer 1

I suggest you look at error log of PHP. It's very likely that the script exceeded max memory available. If so, you may try following actions:
Increase max memory in php.ini file by setting memory_limit parameter or call in your code ini_set('memory_limit', '2048M');;
Break your data into pages with more appropriate count of objects returned.

Answer 2

UPDATE:
Found the error, was missing a charset decoding statement, so just added:
<?php
//open connection to mysql db
$connection = mysqli_connect("localhost","testUser","root", "EasyFridge") or die("Error " . mysqli_error($connection));
//fetch table rows from mysql db
$sql = "SELECT * FROM product";
mysqli_set_charset($connection, "utf8"); //ADDED THIS LINE!!
$result = mysqli_query($connection, $sql) or die("Error in Selecting " . mysqli_error($connection));
error_reporting(E_ALL);
$returnarray = array();
//create an array
while($row = mysqli_fetch_array($result, MYSQL_ASSOC))
{
//$emparray[] = $row[];
$emparray['id'] = $row['id'];
$emparray['name'] = $row['name'];
$emparray['placement_date'] = $row['placement_date'];
$emparray['removal_date'] = $row['removal_date'];
$emparray['type'] = $row['type'];
array_push($returnarray, $emparray);
}
//var_dump($returnarray);
echo json_encode($returnarray);
//close the db connection
mysqli_close($connection);
?>