Drop down list in PHP and MySQL - php

Question

I need to make drop down list as a link to different pages. How do I do that using PHP, MySQL and HTML.
<?php
mysql_connect('localhost','root','');
mysql_select_db('test');
$sql="select first_name from users";
$result=mysql_query($sql);
echo "<select First_name=''>";
echo "<a href='index.html'>";
while($row=mysql_fetch_array($result)){
echo ":<option value='".$row['first_name']."'>".$row['first_name']."</option>";
}
echo"</a>";
echo"</select>";
?>

Answer 1

You can't use links on the option tag, in order to do that, you need to use javascript.
You can try to do something like this:
echo "<select name=\"First_name\" onchange=\"document.location='?'+this.value\">";

Answer 2

PHP is a server-side script and does not manipulate a page after a user has adjusted it. Like real time. Only javascript and others do that. PHP creates a page with what you want to see but if you need to change something bases on a dropdown use java. Here is a function that can do that. It unhides a div tag that can have your info you need.
<script type="text/javascript">
window.onload = function() {
var eSelect = document.getElementById('dropdown');
var divtag1 = document.getElementById('divtag1');
var divtag2 = document.getElementById('divtag2');
eSelect.onchange = function() {
if(eSelect.selectedIndex === 1) {
divtag1.style.display = 'block';
}
if(eSelect.selectedIndex === 2) {
divtag2.style.display = 'block';
}//or if you want it to open a url
if(eSelect.selectedIndex === 3) {
window.open("https://yourwebsite.com", "_NEW");
}
}
}
</script>
echo "<div id=\"divtag1\" style=\"display:none;\">/*your code*/
</div>";
echo "<div id=\"divtag2\" style=\"display:none;\">/*your code*/
</div>";