array_keys or in_array insensitive doesnt work correctly

Question

i have a problem with insensitive array_keys and in_array ... I developing a translator, and i have something like this:

$wordsExample = array("example1","example2","example3","August","example4");
$translateExample = array("ejemplo1","ejemplo2","ejemplo3","Agosto","ejemplo4");


function foo($string,$strict=FALSE)
{
    $key = array_keys($wordsExample,$string,$strict);
    if(!empty($key))
      return $translateExample[$key[0]];
    return false;
}

echo foo('example1'); // works, prints "ejemplo1"
echo foo('august');  // doesnt works, prints FALSE

I tested with in_array and same result...:

function foo($string,$strict=FALSE)
{
    if(in_array($string,$wordsExample,$strict))
      return "WOHOOOOO";
    return false;
}

echo foo('example1'); //works , prints "WOHOOOOO"
echo foo('august'); //doesnt works, prints FALSE

Answer 1

Create the array and find the keys with with strtolower:

$wordsExample = array("example1","example2","example3","August","example4");
$lowercaseWordsExample = array();
foreach ($wordsExample as $val) {
    $lowercaseWordsExample[] = strtolower($val);
}

if(in_array(strtolower('august'),$lowercaseWordsExample,FALSE))
      return "WOHOOOOO";

if(in_array(strtolower('aUguSt'),$lowercaseWordsExample,FALSE))
      return "WOHOOOOO";

Another way would be to write a new in_array function that would be case insensitive:

function in_arrayi($needle, $haystack) {
    return in_array(strtolower($needle), array_map('strtolower', $haystack));
}

If you want it to use less memory, better create the words array using lowercase letter.

Answer 2

I created a small function a while to get, to test clean-URLs as they could be uppercase, lowercase or mixed:

function in_arrayi($needle, array $haystack) {

    return in_array(strtolower($needle), array_map('strtolower', $haystack));

}

Pretty easy this way.