Check if a MySql database has been updated in PHP - php

Question

I am trying to detect whether a MySql database has been updated the second it has been updated. So far I've just found triggers but it, https://www.siteground.com/kb/mysql-triggers-use/, said I need superuser privileges and, unfortunately, the domain I use is a shared server.
So currently there is one group working on inserting all user information into the database like so.
<form method="post">
-> user post data
</form>
<?php
-> post data to varibles, $x $y as examples
$servername = "localhost";
$username = "user";
$password = "pass";
$dbname = "name";
// Check connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
if(!$conn){
die("Connection failed: " . mysqli_connect_error());
}
$sql = "INSERT INTO Test (Col1, Col2)
VALUES (". $x .",". $y .")";
mysqli_close($conn);
?>
And then my group, in a separate file, is supposed to get the data from the database when it is updated. Our file set up looks like this.
<?php
$servername = "localhost";
$username = "user";
$password = "pass";
$dbname = "name";
// Check connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
if(!$conn){
die("Connection failed: " . mysqli_connect_error());
}
->trigger on column update
$sql = "SELECT Col1, Col2, time FROM Test";
$result = mysqli_query($conn, $sql);
->etc.
mysqli_close($conn);
?>
So far I've only found triggers that are in MySql but there doesn't seem to be a way to directly do it in PHP ex.
mysql> CREATE TRIGGER agecheck BEFORE INSERT ON people FOR EACH ROW;