Saving a value from select option to database - php

Question

So i am trying to insert some data in my database, unfortunatly it doesn't work as i hoped.
This is my index.php file here i made a little piece of php code to get the select options from my database(this works fine). But now i want people to select from the options in my database and store the selected option in another db table.
<?php
$query = "SELECT event_naam FROM events";
$result2 = mysqli_query($dbconn, $query);
$options = "";
while($row2 = mysqli_fetch_array($result2))
{
$options = $options."<option>$row2[0]</option>";
}
?>
<form class="inschrijven" method="POST" action="includes/inscscript.php">
<select name="iselect">
<?php echo $options;?>
</select><br><br>
<span>Uw Naam: </span><input type="text" name="inaam" placeholder="Naam"><br>
<span>Leeftijd: </span><input type="number" name="leeftijd"><br>
<span>Aantal Personen:</span><input type="number" name="personen"><br>
<input type="submit" name="inschrijven" value="Inschrijven!">
</form>
I have tried this, but it doesn't do anything it also doesn't give an error.
require_once 'connectie.php'; //Connection to Database File
$sql = "INSERT INTO inschrijven (inschrijf_event, inschrijf_naam, inschrijf_leeftijd, inschrijf_personen) VALUES
('".$_POST['iselect']."','".$_POST['inaam']."','".$_POST['leeftijd']."','".$_POST['personen']."')";
if ($dbconn->query($sql) === TRUE) {
header( "Location: ../index.php" );
} else {
echo "<script type= 'text/javascript'>alert('Error: " . $sql . "<br>" . $dbconn->error."');</script>";
}
$dbconn->close();
This is my inscscript.php file
I tried searching for similair qeustions but couldn't find anything like this.

Answer 1

$query = "SELECT event_naam FROM events";
$result=mysqli_query($con,$query)
{
// Return the number of rows in result set
while($rowcount=mysqli_num_rows($result)){
echo "<option value='".$rowcount['event_naam']."'>".$rowcount['event_naam']."</option>
}
Include this php file to your html between select opend and closing tags