c php.net
## HOMEBREW str_ireplace() FOR PRE-PHP 5.0
if (!function_exists(\'str_ireplace\') {
function str_ireplace($search,$replace,$subject) {
$token = \'^[[term^]\';
$haystack = strtolower($subject);
$needle = strtolower($search);
while (($pos=strpos($haystack,$needle))!==FALSE) {
$c++;
$subject = substr_replace($subject,$token,$pos,strlen($search));
$haystack = substr_replace($haystack,$token,$pos,strlen($search));
}
while (($pos=strpos($subject,$token))!==FALSE) {
$subject = substr_replace($subject,$replace,$pos,strlen($token));
}
return $subject;
}
}