#43334 [Csd->Opn]: isset behaviour with multiple parameters

ID: 43334 User updated by: nicholsr@php.net Reported By: nicholsr@php.net -Status: Closed +Status: Open Bug Type: Documentation problem Operating System: Irrelevant PHP Version: Irrelevant New Comment: What was added to the documentation was this: "If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stop as soon as a set variable is encountered." Unfortunately this is not quite right. It should say: "If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stop as soon as an unset variable is encountered." Previous Comments: ------------------------------------------------------------------------ [2007-11-21 11:37:50] vrana@php.net This bug has been fixed in the documentation's XML sources. Since the online and downloadable versions of the documentation need some time to get updated, we would like to ask you to be a bit patient. Thank you for the report, and for helping us make our documentation better. "If multiple parameters are supplied then isset() will return TRUE only if all of the parameters are set. Evaluation goes from left to right and stop as soon as a set variable is encountered." ------------------------------------------------------------------------ [2007-11-19 11:59:08] nicholsr@php.net Description: ------------ The documentation for isset does not clearly describe the behaviour for multiple parameters. I suggest that the "Description" is revised by adding the following: If multiple parameters are supplied then isset will return TRUE only if all of the parameters are not NULL or unset. I suggest that the "Notes" is revised by adding the following: "If multiple parameters are supplied then isset evaluates them in order left to right. It stops evaluating the parameters as soon as an unset parameter is encountered." Reproduce code: --------------- <?php echo "this generates a warning about b not being set \n"; var_dump (isset ($a[$b])); echo "this generates no warning \n"; var_dump (isset ($c, $a[$b])); ?> Expected result: ---------------- this generates a warning about b not being set PHP Notice: Undefined variable: b in C:\cygwin\home\nicholsr\1.php on line 3 bool(false) this generates no warning bool(false) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=43334&edit=1