note 128966 added to language.operators.precedence

PHP and SQL have different approaches to null-handling. In PHP, arithmetic operations on null treat it as zero: <?php echo 5 + null; //5 echo 5 * null; //0 $x = null; $x++; echo $x; //1 ?> whereas in SQL, most operations, where any parameter is null, are null: 5 + null; //null 5 * null; //null Nulls in strings are sometimes converted to '' and sometimes errors: <?php echo "hello" . null . "there"; //"hellothere" echo strlen(null); //used to be 0, now causes error. ?> ---- Server IP: 45.112.84.4 Probable Submitter: 45.91.157.134 (proxied: 82.8.243.31) ---- Manual Page -- https://php.net/manual/en/language.operators.precedence.php Edit -- https://main.php.net/note/edit/128966 Del: integrated -- https://main.php.net/note/delete/128966/integrated Del: useless -- https://main.php.net/note/delete/128966/useless Del: bad code -- https://main.php.net/note/delete/128966/bad+code Del: spam -- https://main.php.net/note/delete/128966/spam Del: non-english -- https://main.php.net/note/delete/128966/non-english Del: in docs -- https://main.php.net/note/delete/128966/in+docs Del: other reasons-- https://main.php.net/note/delete/128966 Reject -- https://main.php.net/note/reject/128966 Search -- https://main.php.net/manage/user-notes.php