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 *in*sensitive? For example, I type in "fOoTbAlL" and php will direct me to Fb01.html normally.

EDIT: 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

I would use a string function strtolower(). http://uk3.php.net/strtolower

Answer 2

$searchsport = strtolower($_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;
}

Answer 3

easiest way is to use strtolower to make everything lowercase to make your comparison

Answer 4

You can modify your code like this:

// searches for values in case-insensitive manner
function in_arrayi($needle, $haystack) {
    return in_array(strtolower($needle), array_map('strtolower', $haystack));
}

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