the test i need should give the following results: - FALSE when $a->b does not exist at all - TRUE when $a->b = null - TRUE when $a->b = <any value> empty() gives true for both $a->b = null and not setting any value, so that's no good. borokovs suggestion seems to miss the purpose. anyone else? On 17/08/07, Colin Guthrie <gmane@xxxxxxxxxxxxxx> wrote: > Olav Mørkrid wrote: > > how do i test if a property of a stdclass object is set, even if its > > value is null, similar to how array_key_exists() works for arrays. > > > > the following method fails: > > > > $a->b = null; > > if(isset($a->b)) > > echo "yes"; > > > > and property_exists() seems only to work for defined objects. > > > > hope someone can help. thanks! > > You can try: > unset($a-b) > > Or change isset() to empty(). > > empty() catches more than isset() e.g. '' (empty string), false, 0 etc. > are considered "empty". Depending on your logic it can still be very > useful. It is a language construct rather than a function so it's also > efficient. > > Col > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
