Headers Manipulation

Basic Setting of a Header

Here is a basic setting of the Header to change to a new page when a button is clicked.
if(isset($_REQUEST['action']))
{
    switch($_REQUEST['action'])
    {  //Setting the Header based on which button is clicked
        case 'getState':
            header("Location: https://NewPageForState.com/getState.php?search=" . $_POST['search']);
            break;
        case 'getProject':
            header("Location: https://NewPageForProject.com/getProject.php?search=" . $_POST['search']);
            break;
}
else
{
    GetSearchTerm(!NULL);
}
//Forms to enter a State or Project and click search
function GetSearchTerm($success)
{
    if (is_null($success))
    {
        echo "<h4>You must enter a state or project number</h4>";
    }
    echo "<center><strong>Enter the State to search for</strong></center><p></p>";
    //Using the $_SERVER['PHP_SELF'] keeps us on this page till the switch above determines where to go
    echo "<form action='" . $_SERVER['PHP_SELF'] . "' enctype='multipart/form-data' method='POST'>
            <input type='hidden' name='action' value='getState'>
            <center>State: <input type='text' name='search' size='10'></center><p></p>
            <center><input type='submit' name='submit' value='Search State'></center>
            </form>";
   
    GetSearchTermProject($success);
}

function GetSearchTermProject($success)
{
    echo "<center><br><strong>Enter the Project to search for</strong></center><p></p>";
    echo "<form action='" . $_SERVER['PHP_SELF'] . "' enctype='multipart/form-data' method='POST'>
            <input type='hidden' name='action' value='getProject'>
            <center>Project Number: <input type='text' name='search' size='10'></center><p></p>
            <center><input type='submit' name='submit' value='Search Project'></center>
            </form>";
}