note 114699 added to language.types.null

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". ---- Server IP: 72.52.91.14 Probable Submitter: 89.78.6.71 ---- Manual Page -- http://php.net/manual/en/language.types.null.php Edit -- https://master.php.net/note/edit/114699 Del: integrated -- https://master.php.net/note/delete/114699/integrated Del: useless -- https://master.php.net/note/delete/114699/useless Del: bad code -- https://master.php.net/note/delete/114699/bad+code Del: spam -- https://master.php.net/note/delete/114699/spam Del: non-english -- https://master.php.net/note/delete/114699/non-english Del: in docs -- https://master.php.net/note/delete/114699/in+docs Del: other reasons-- https://master.php.net/note/delete/114699 Reject -- https://master.php.net/note/reject/114699 Search -- https://master.php.net/manage/user-notes.php