I'm trying to check if a color is already entered into the database if it is the color should not be entered and stored into the database and the following error code <p>This color has already been entered!</p> should be displayed. But for some reason I cant get this to work, can someone please help me?

The color names are entered into $_POST['color'] which is an array entered by the user.

Here is the html code that collects the colors.

<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />
<input type="text" name="color[]" />

Here is the PHP & MySQL code.

for($i=0; $i < count($_POST['color']); $i++) {
    $color = "'" . $_POST['color'][$i] . "'";
}

$mysqli = mysqli_connect("localhost", "root", "", "sitename");
$dbc = mysqli_query($mysqli,"SELECT * 
                             FROM colors 
                             WHERE color = '$color' 
                             AND user = '$user_id' ");

if(mysqli_num_rows($dbc) == TRUE) {
    echo '<p>This color has already been entered!</p>';
} else if(mysqli_num_rows($dbc) == 0) {
    // enter the color into the database
}