note 89078 added to function.is-null

If you want to test if a class is null or not, always use is_null($class) instead of "$class == null". If the class instance has no members, then "$class == null" will be true. Here is an example: class ClassA { function printSomething() { print('Something'); } } class ClassB { var $doNothing; function ClassB() { $this->doNothing = 'Nothing'; } function printSomething() { print('Something'); } } $a = new ClassA(); print('<br> #1: ' . ($a == null ? '$a is null' : '$a is not null')); print('<br> #2: ' . (is_null($a) ? '$a is null' : '$a is not null')); $b = new ClassB(); print('<br> #3: ' . ($b == null ? '$b is null' : '$b is not null')); print('<br> #4: ' . (is_null($b) ? '$b is null' : '$b is not null')); The output of above is: #1: $a is null #2: $a is not null #3: $b is not null #4: $b is not null ---- Server IP: 87.124.35.190 Probable Submitter: 80.177.30.147 ---- Manual Page -- http://www.php.net/manual/en/function.is-null.php Edit -- https://master.php.net/note/edit/89078 Del: integrated -- https://master.php.net/note/delete/89078/integrated Del: useless -- https://master.php.net/note/delete/89078/useless Del: bad code -- https://master.php.net/note/delete/89078/bad+code Del: spam -- https://master.php.net/note/delete/89078/spam Del: non-english -- https://master.php.net/note/delete/89078/non-english Del: in docs -- https://master.php.net/note/delete/89078/in+docs Del: other reasons-- https://master.php.net/note/delete/89078 Reject -- https://master.php.net/note/reject/89078 Search -- https://master.php.net/manage/user-notes.php