note 86627 added to language.operators.comparison

The cast from null to boolean is documented (on the page describing the boolean type: null->false), and so is the cast from boolean to integer (on the page describing the integer type: false->0), but the cast from null to integer is undefined and the fact that it is currently implemented by casting from null to boolean and then from boolean to integer is explicitly documented (on the page describing the integer type) as something that should not be relied on (so null==0 is true only by accident, but ((int)(bool)null)==0 is true per specification). Perhaps as well as a "Converting to integer" section on the integer type page there should also be a "Converting from integer" section; similarly for the other types. ---- Server IP: 203.89.181.186 Probable Submitter: 114.134.161.9 ---- Manual Page -- http://www.php.net/manual/en/language.operators.comparison.php Edit -- https://master.php.net/note/edit/86627 Del: integrated -- https://master.php.net/note/delete/86627/integrated Del: useless -- https://master.php.net/note/delete/86627/useless Del: bad code -- https://master.php.net/note/delete/86627/bad+code Del: spam -- https://master.php.net/note/delete/86627/spam Del: non-english -- https://master.php.net/note/delete/86627/non-english Del: in docs -- https://master.php.net/note/delete/86627/in+docs Del: other reasons-- https://master.php.net/note/delete/86627 Reject -- https://master.php.net/note/reject/86627 Search -- https://master.php.net/manage/user-notes.php