PHP making input from web form case insensitive?

Question

So I have some code here that takes user input from a standard web form:

if (get_magic_quotes_gpc()) {
    $searchsport = stripslashes($_POST['sport']);
    $sportarray = array(
        "Football" => "Fb01",
        "Cricket" => "ck32",
        "Tennis" => "Tn43",
    );
    if (isset($sportarray[$searchsport])) {
        header("Location: " . $sportarray[$searchsport] . ".html");
    die;
}

How would I go about modifying this (I think the word is parsing?) to make it case insensitive? For example, I type in "fOoTbAlL" and PHP will direct me to Fb01.html normally.

Note that the code is just an example. The string entered by the user can contain more than one word, say "Crazy aWesOme HarpOOn-Fishing", and it would still work if the array element "Crazy Awesome Harpoon-Fishing" (take note of the capital F before the dash).

Answer 1

$searchsport = strtolower($_POST['sport']);
$sportarray = array(
    "football" => "Fb01",
    "cricket" => "ck32",
    "tennis" => "Tn43",
);
if (isset($sportarray[$searchsport])){
    header("Location: " . $sportarray[$searchsport] . ".html");
    die;
}

In this way the search string and the array keys are both lowercase and you can do a case insensitive comparison.

If you want to preserve the case of the $sportarray keys you can do:

$searchsport = ucfirst(strtolower($_POST['sport']));
$sportarray = array(
    "Football" => "Fb01",
    "Cricket" => "ck32",
    "Tennis" => "Tn43",
);
if (isset($sportarray[$searchsport])){
    header("Location: " . $sportarray[$searchsport] . ".html");
    die;
}