I think that it’s better to use simply str_replace, like the manual says:
If you don’t need fancy replacing
rules (like regular expressions), you
should always use this function
instead of ereg_replace() or
preg_replace().
<?
$badUrl = "http://www.site.com/backend.php?/c=crud&m=index&t=care";
$goodUrl = str_replace('?/', '?', $badUrl);