Issues with PHP while statement - php

Question

I'm attempting to run a while statement that will set a column in a mysql database, based on a uniqueID.
I've done this many times, and I'm not sure what I am doing wrong this time.
Basically, it works properly until I actually tell it to save the table. Here is my code
$alertAdmin = mysqli_query($con, "SELECT * FROM tickets WHERE notified='0'");
$tcheckNotifs = mysqli_num_rows($alertAdmin);
if($tcheckNotifs > 0) {
echo "test<br><br>";
while($row = mysqli_fetch_array($alertAdmin))
{
$Unique = $row['UniqueID'];
echo $Unique.' ';
$sql = "UPDATE tickets SET `notified`='1' WHERE `UniqueID`='$Unique'";
//mysqli_query($con, $sql);
}
}
And this works for echoing the UniqueID, and it echos the correct one. The problem comes in when I uncomment the mysqli_query($con, $sql);
in which case, nothing inside the loop is echo'd, but it DOES save the database.
For example:
Lets say this while statement loops through and finds 3 iterations of rows that have notified equal to 0 (UniqueID's 29, 26, 25), while the mysqli_query is commented, it will display these numbers on the page just fine. But as soon as I uncomment it, the database will save but it does not display any of the rest of the while loop on the page.
I need this desperately, because I plan to send a desktop notification at the same time the loop is played.
FOLLOW UP:
It also does not display the echo "test<br><br>"; on the page when the query is uncommented either.
Another follow up:
The query is saving all the data like its meant to. The problem is nothing else inside the tcheckNotifs IF statement are showing (echo's and such), like they aren't being executed. Almost like the end of the while statement is executing before anything else, including the "test" echo before the while statement.
Could anyone help me figure out why this isn't working as expected?
Here is all of my current code, with some suggestions from you guys added in, but still not working properly.
The while statement will save the query, but no other output is shown on the page.
$configs = include("config.php");
$con = mysqli_connect($configs['SQL-Host'], $configs['SQL-User'], $configs['SQL-Pass'], $configs['SQL-Database']) or die("Error " . mysqli_error($con));
if (session_status() == PHP_SESSION_NONE) {
session_start();
}
$alertAdmin = mysqli_query($con, "SELECT * FROM tickets WHERE notified='0'");
$tcheckNotifs = mysqli_num_rows($alertAdmin);
if($tcheckNotifs > 0) {
echo "test<br><br>";
flush(); ob_flush();
while($row = mysqli_fetch_array($alertAdmin))
{
$Unique = $row['UniqueID'];
echo $Unique.' ';
updateTickets($con, $Unique);
}
echo "test<br><br>";
}
function updateTickets($con, $id){
$sql = "UPDATE tickets SET notified=1 WHERE UniqueID=$id";
mysqli_query($con, $sql);
}

Answer 1

FINAL UPDATE
With the help of Alex Andrei as well, we moved to PDO
$dsn = 'mysql:dbname=domains;host=localhost';
$user = 'root';
$password = '';
try {
$db = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
$st = $db->prepare('SELECT UniqueID FROM tickets WHERE notified=0');
$st->execute();
$result = $st->fetchAll(PDO::FETCH_ASSOC);
foreach($result as $d){
echo $d['UniqueID'] . "<br/>";
$id = $d['UniqueID'];
$st = $db->prepare("UPDATE tickets SET notified=1 WHERE UniqueID=$id");
$st->execute();
}
SECOND UPDATE
Try putting your query in a variable and run the loop like this...
while($row = mysqli_fetch_array($alertAdmin))
{
$Unique = $row['UniqueID'];
echo $Unique.' ';
$sql = "UPDATE tickets SET notified=1 WHERE UniqueID=$Unique";
$update = mysqli_query($con, $sql);
}
UPDATE
There is a chance the query runs first like you said. Maybe you can create an independent function to run the query and call the function from inside the while loop.
function updateTickets($con, $id){
$sql = "UPDATE tickets SET notified=1 WHERE UniqueID=$id";
mysqli_query($con, $sql);
}
And your loop would look like this...
while($row = mysqli_fetch_array($alertAdmin))
{
$Unique = $row['UniqueID'];
echo $Unique.' ';
updateTickets($con, $Unique);
}
ORIGINAL ANSWER
I would modify your query like this...
$sql = "UPDATE tickets SET notified=1 WHERE UniqueID=$Unique";
You do not need all the back ticks nor single quotes here. Might be causing an issue.
Also, I assume 1 is an integer so no need to quote that.

Answer 2

The Fix: PDO OF COURSE!
$configs = include("config.php");
$dsn = 'mysql:dbname='.$configs['SQL-Database'].';host='.$configs['SQL-Host'].'';
$user = $configs['SQL-User'];
$password = $configs['SQL-Pass'];
try {
$db = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
$st = $db->prepare('SELECT UniqueID FROM tickets WHERE notified=0');
$st->execute();
$result = $st->fetchAll(PDO::FETCH_ASSOC);
foreach($result as $d){
echo $d['UniqueID'] . "<br/>";
$id = $d['UniqueID'];
$st = $db->prepare("UPDATE tickets SET notified=1 WHERE UniqueID=$id");
$st->execute();
}

Answer 3

$sql = "UPDATE tickets SET notified='1' WHERE UniqueID='$Unique'";
The error I think it's here. You can't use $Unique between single quotes (although you already are between double quotes).
Try to fixing this replacing the line with:
$sql = "UPDATE tickets SET `notified`='1' WHERE `UniqueID`=$Unique";

Answer 4

Firstly in your query you are passing a string in: ...WHERE "UniqueID"="$Unique" because of the quotes around your php variable. So your query looks like this: WHERE UniqueID = "10". Not a big deal but generally if your looking up a number your should drop the quotes.
And i suspect something is causing your query in the loop to fail, so add something to check for errors:
if(!$queryResult){
echo $con->error;
}
Run the loop and see if something is causing errors in your query. But really you should get rid of most of the backticks you have in your queries.