PHP case-insensitive in_array function

Question

Is it possible to do case-insensitive comparison when using the in_array function?

So with a source array like this:

$a= array(
 \'one\'         


        

Answer 1

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

From Documentation