php - search form with drop down - php

Question

I am trying to create a basic advanced search with an input which will then search through any results that have a matching category field that is selected in the dropdown and then also a matching keyword field for company_name in "advancedSearch". I have gotten to the stage where I can use the drop down to then display the matching data but I’m having trouble querying that with the search input.
Here is my form code from index.php
<form action="advanced-search.php" method="POST">
<input id="advancedInput" placeholder="Advanced Search" type="search" name="advancedSearch">
<?php
$sqlSelect="SELECT category FROM categories";
$result = $db -> query ($sqlSelect);
echo "<select id=\"selectAdvanced\" name=\"value\">";
echo "<option></option>";
while ($row = mysqli_fetch_array($result)) {
$rows[] = $row;
}
foreach ($rows as $row) {
print "<option value='" . $row['category'] . "'>" . $row['category'] . "</option>";
}
echo "</select>";
?>
<input type="submit" value="search"/>
</form>
And here is the code from my advanced-search.php
<?php
if(isset($_POST['value']) && !empty($_POST['value'])) {
$username = trim(strip_tags($_POST['value']));
include('dbConfig.php');
if (mysqli_connect_errno()) {
printf("Can't connect: %s\n", mysqli_connect_error());
exit();
}
$where = ($username == "category")? "" : " WHERE category = '$username'";
$sql = "SELECT * FROM company_listings" . $where; // Create Query
$result = mysqli_query($db, $sql); // Run Query
echo "<table border=1><tr><th>id</th><th>name</th><th>created</th></tr>";
while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['company_name'] . "</td>";
echo "<td>" . $row['created'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_free_result($result);
}
This code works great for echoing out the matching categories from the dropdown but I cant work out how I would further query the search from the "advanced search" input.
Any help would be greatly appreciated.

Answer 1

I worked out that using AND in my query like this and using the Request on submit I was able to get what I was after... Thanks to #ADyson for the nudge. I have added my updated advanced-search.php file below;
if(isset($_REQUEST['submit'])){
$username = (($_POST['value']));
$advanced = (($_POST['advancedSearch']));
include('dbConfig.php');
if (mysqli_connect_errno()) {
printf("Can't connect: %s\n", mysqli_connect_error());
exit();
}
$sql=" SELECT * FROM company_listings WHERE company_name like '%".$advanced."%' AND category LIKE '%".$username."%'";
$result = mysqli_query($db, $sql); // Run Query
echo "<table border=1><tr><th>id</th><th>name</th><th>created</th></tr>";
while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['company_name'] . "</td>";
echo "<td>" . $row['created'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_free_result($result);
}