Doc #61513 [Opn->Csd]: clone operator precedence is wrong

Edit report at https://bugs.php.net/bug.php?id=61513&edit=1 ID: 61513 Updated by: cmb@php.net Reported by: antickon at gmail dot com Summary: clone operator precedence is wrong -Status: Open +Status: Closed Type: Documentation Problem Package: Documentation problem PHP Version: 5.3.10 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Fixed with <http://svn.php.net/viewvc?view=revision&revision=347901>. Previous Comments: ------------------------------------------------------------------------ [2018-01-10 10:32:40] pasindu@php.net So is the suggestions here to remove "[" from the docs or maybe add note about this? ------------------------------------------------------------------------ [2012-03-29 13:48:56] antickon at gmail dot com Even if [ is an amalgam of syntactic constructs, precedence and associativity are properties it appears to have. Having it correctly documented is absolutely preferable. ------------------------------------------------------------------------ [2012-03-29 13:37:19] nikic@php.net clone/new are defined with higher precedence in the parser. But there is no general expr [ dim_offset ] rule (only specific rules for various variable syntaxes), so it can't be interpreted as (clone $a)[0]. Hard to say what one can do about this in the docs. Maybe removing [ from the list might be a viable option. Variable offset access is kinda outside the normal precedence rules. ------------------------------------------------------------------------ [2012-03-26 14:33:49] antickon at gmail dot com Description: ------------ --- From manual page: http://www.php.net/language.operators.precedence --- According to the Operator Precedence table, the clone operator has higher precedence than [. This would mean clone $arraylike[0] is evaluated as ( clone $arraylike )[0], but it seems that the implementation does clone ( $arraylike[0] ). I think this is probably correct behavior, so I conclude the documentation is incorrect. Test script: --------------- $a = array( new stdClass() ); clone $a[0]; Expected result: ---------------- in this case, some type error at runtime since you can't clone an array Actual result: -------------- the object at offset 0 is cloned ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=61513&edit=1