Populating select box with existing value - php

Question

I have created a form which allows users to edit existing data within a database, I pull information from one page to the next to populate text boxes and select boxes. I have managed to populate the select box with the correct value but when the update statement goes through it deletes or doesn't recognize the pre-existing value. Can anyone help?
if (isset($_POST['submit'])) {
// Process the form
if (empty($errors)) {
$id = $brand["brandId"];
$brandName = mysql_prep($_POST["brandName"]);
$brandCategory = mysql_prep($_POST["brandCategory"]);
$brandKeyword = mysql_prep($_POST["brandKeyword"]);
$addedBy = mysql_prep($_SESSION['username']);
$query = "UPDATE brands SET ";
$query .= "brandName = '{$brandName}', ";
$query .= "brandCategory = '{$brandCategory}', ";
$query .= "brandKeyword = '{$brandKeyword}', ";
$query .= "addedBy = '{$addedBy}', ";
$query .= "dateTime = CURRENT_TIMESTAMP ";
$query .= "WHERE brandId = '{$id}' ";
$query .= "LIMIT 1";
$result = mysqli_query($connection, $query);
if ($result && mysqli_affected_rows($connection) == 1) {
// Success
$_SESSION["message"] = "Brand updated.";
redirect_to("search.php");
} else {
// Failure
$_SESSION["message"] = "Brand update failed.";
}
}
} else {
// This is probably a GET request
} // end: if (isset($_POST['submit']))
?>
<?php $layout_context = "user"; ?>
<?php include("../includes/layouts/header.php"); ?>
<?php include("../includes/layouts/navigation.php"); ?>
<div class="section">
<div id="message">
<?php echo message(); ?>
<?php echo form_errors($errors); ?>
</div>
<form id="edit_brands" action="edit_brands.php?id=<?php echo urlencode($brand["brandId"]); ?>" method="post">
<h2>Edit Brand Information: <?php echo htmlentities($brand["brandName"]);?></h2>
<p>
<label for="bname">Brand Name:</label>
<input class="textbox" id="bname" type="text" name="brandName" value="<?php echo htmlentities($brand["brandName"]); ?>" autofocus/>
</p>
<p>
<label for="bcategory">Brand Category:</label>
<select class="textbox" id="bcategory" type="text" name="brandCategory">
<option value=""><?php echo htmlentities($brand["brandCategory"]); ?></option>
<option value="Animation">Animation</option>
<option value="Automotive">Automotive</option>
<option value="Beauty and Fashion">Beauty & Fashion</option>
<option value="Comedy">Comedy</option>
<option value="Cooking and Health">Cooking & Health</option>
<option value="DIY">DIY</option>
<option value="Fashion">Fashion</option>
<option value="Film and Entertainment">Film & Entertainment</option>
<option value="Food and Drink">Food & Drink</option>
<option value="Gaming">Gaming</option>
<option value="Lifestyle">Lifestyle</option>
<option value="Music">Music</option>
<option value="News and Politics">News & Politics</option>
<option value="Science&Education">Science & Education</option>
<option value="Sports">Sports</option>
<option value="Technology">Technology</option>
<option value="Television">Television</option>
</select>
</p>
<p>
<label for="bkeyword">Brand Keyword:</label>
<textarea class="FormElement" id="bkeyword" name="brandKeyword" id="brandKeyword" placeholder=""><?php echo htmlentities($brand["brandKeyword"]); ?></textarea>
</p>
<p>
<input type="submit" class="button" name="submit" value="Edit Brand" onclick="return confirm('Do you wish to edit brand?');"/>
</p>
<p>
Cancel
</p>
</form>
</div>
</div>

Answer 1

The best way is to build the select from an array.
For instance:
<?php
$array = array('Animation', 'Automotive', 'Beauty and Fashion ', ...);
echo '<select class="textbox" id="bcategory" type="text" name="brandCategory">';
foreach ($array as $value){
if($value == htmlentities($brand["brandCategory"]){
echo '<option value='.$value.' selected>'.$value.'</option>';
}else{
echo '<option value='.$value.'>'.$value.'</option>';
}
}
echo '</select>;
This way you can check if the value in the array is the same that the one recieved by post and then add the selected attribute to the option tag.