Dynamically insert class="active" into php function that generates bootstrap menu - php

Question

I have tried pretty much every solution that was available online but cannot get the class="active" to change dynamically for each menu section.
When someone clicks the top level menu item it opens up the second level menu and if someone click the on a second level menu item in that section class="active" needs to remain on the top level menu li tag.
I have the following function that generates my bootstrap menu:
function getMenu() {
global $connection;
mysqli_select_db($connection, "c9");
$query = ("SELECT testName, testId FROM testType");
$result_set = mysqli_query($connection, $query);
while ($row = mysqli_fetch_array($result_set)) {
$testId = $row['testId'];
$testName = $row['testName'];
echo '<li>'; //This is where class="active" needs to be added
echo '<span class="nav-label">'.$testName.'</span>';
echo '<ul class="nav nav-second-level collapse">';
echo '<li>Summary Report</li>';
echo '<li>Add Data</li>';
echo '</ul>';
echo '</li>';
}
}
And the menu structure is as follows:
<ul class="nav metismenu" id="side-menu">
<li class="active">
<a href="/">
<span class="nav-label">Summary</span>
<ul class="nav nav-second-level collapse in">
<li>Reports</li>
</ul>
</li>
<li><a href="#">
<span class="nav-label">Temperature</span>
<ul class="nav nav-second-level collapse">
<li>Summary Report</li>
<li>Add Data</li>
</ul>