note 83588 added to function.is-null

$var===NULL is much faster than is_null($var) (with the same result) I did some benchmarking with 10 million iterations: $a=null; isset($a); Took: 1.71841216087s $a==NULL; Took: 1.27205181122s $a===NULL; Took: 1.2424390316s is_null($a); Took: 3.70693397522s $a=5; isset($a); Took: 1.15165400505s $a==NULL; Took: 1.41901302338s $a===NULL; Took: 1.21655392647s is_null($a); Took: 3.78501200676s error_reporting(E_ALL&~E_NOTICE); unset($a); isset($a); Took: 1.51441502571s $a==NULL; Took: 16.5414860249s $a===NULL; Took: 16.1273870468s is_null($a); Took: 23.1918480396s Please note, that isset is only included because it gives a good performance in any case; HOWEVER isset is NOT the same, or the opposite. But you might be able to use isset() instead of null-checking. You should not use is_null, except when you need a callback-function, or for conformity with is_int, is_float, etc. ---- Server IP: 89.248.170.61 Probable Submitter: 82.93.241.107 ---- Manual Page -- http://www.php.net/manual/en/function.is-null.php Edit -- https://master.php.net/note/edit/83588 Del: integrated -- https://master.php.net/note/delete/83588/integrated Del: useless -- https://master.php.net/note/delete/83588/useless Del: bad code -- https://master.php.net/note/delete/83588/bad+code Del: spam -- https://master.php.net/note/delete/83588/spam Del: non-english -- https://master.php.net/note/delete/83588/non-english Del: in docs -- https://master.php.net/note/delete/83588/in+docs Del: other reasons-- https://master.php.net/note/delete/83588 Reject -- https://master.php.net/note/reject/83588 Search -- https://master.php.net/manage/user-notes.php