#33622 [Opn->Csd]: $i++ is not $i+1

ID: 33622 Updated by: vrana@php.net Reported By: meh at v-cm dot net -Status: Open +Status: Closed Bug Type: Documentation problem Operating System: Windows XP PHP Version: 4.3.11 New Comment: 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. "Decrementing NULL values has no effect too, but incrementing them results in 1." Previous Comments: ------------------------------------------------------------------------ [2005-07-10 00:11:12] johannes@php.net it should also mention NULL: NULL++ -> 1 NULL-- -> NULL and maybe even arrays and objects should be mentioned - they don't change. ------------------------------------------------------------------------ [2005-07-09 17:59:06] sean@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. added note: "The increment/decrement operators do not affect boolean values." to language.operators.increment ------------------------------------------------------------------------ [2005-07-09 14:44:00] derick@php.net Right, but afaik it's not documented, so making it a doc problem. ------------------------------------------------------------------------ [2005-07-09 14:43:34] helly@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php . ------------------------------------------------------------------------ [2005-07-09 14:36:22] meh at v-cm dot net Description: ------------ The operators ++ and -- don't increment/decrement boolean values. This behaviour could be extremly annoying when you have something like: $key = array_search($thekey, array_keys($thearray)); for($i=$key; $x<count($thearray); $i++) echo "foo"; Workaround: $key = array_search($thekey, array_keys($thearray)); if($key==false) $key=0; for($i=$key; $x<count($thearray); $i++) echo "foo"; If this behaviour is intended, then it should at least be documented that ++,-- doens't convert boolean values. Reproduce code: --------------- // Works $x = false; echo $x+1; // Outputs 1 // Doesn't work $x= false; $x++; echo $x; // Outputs nothing Expected result: ---------------- 11 Actual result: -------------- 1 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=33622&edit=1