note 108792 added to function.array-key-exists

I am confused by comments stating that array_key_exists is fast, or maybe 1.5x slower then isset: bash$: php -v PHP 5.3.5 (cli) (built: Jan 23 2012 11:13:00) bash$ time php -r '$array =array("foo" => "bar");for($i = 0; $i < 10000000; $i++) { array_key_exists("foo", $array);array_key_exists("bar", $array);}' real 0m20.036s bash$ time php -r '$array =array("foo" => "bar");for($i = 0; $i < 10000000; $i++) { isset($array["foo"]);isset($array["bar"]);}' real 0m2.553s bash$ uname -opisr Linux 2.6.18-194.3.1.el5 x86_64 x86_64 GNU/Linux ---- Server IP: 69.147.83.197 Probable Submitter: 64.124.74.4 ---- Manual Page -- http://www.php.net/manual/en/function.array-key-exists.php Edit -- https://master.php.net/note/edit/108792 Del: integrated -- https://master.php.net/note/delete/108792/integrated Del: useless -- https://master.php.net/note/delete/108792/useless Del: bad code -- https://master.php.net/note/delete/108792/bad+code Del: spam -- https://master.php.net/note/delete/108792/spam Del: non-english -- https://master.php.net/note/delete/108792/non-english Del: in docs -- https://master.php.net/note/delete/108792/in+docs Del: other reasons-- https://master.php.net/note/delete/108792 Reject -- https://master.php.net/note/reject/108792 Search -- https://master.php.net/manage/user-notes.php