note 114699 deleted from language.types.null by cmb

Note Submitter: kuzawinski dot marcin at NOSPAM dot gmail dot com ---- Funny. It looks like, that there is one, and only one possible value for variable $a that will pass this test: ($a != NULL) && ((bool)$a == NULL) It's "0" and it works because casting string "0" to boolean gives FALSE (and it's the only non empty string, that works this way). So remember that casting is not "transitive".