#36832 [Opn->Csd]: ternery operator parser improvement

ID: 36832 Updated by: colder@php.net Reported By: rdoggett at oz dot net -Status: Open +Status: Closed Bug Type: Documentation problem Operating System: any PHP Version: 5.1.2 New Comment: This is already stated in the documentation: http://ch2.php.net/language.operators.comparison#language.operators.comparison.ternary Previous Comments: ------------------------------------------------------------------------ [2006-03-23 12:59:47] rdoggett at oz dot net Description: ------------ The ternery operator causes grief because its parsing precedence is makedly different from other languages, as shown in the attached code. One could reasonably expect the output to be "1 < 2", and indeed this is the case when translated to perl, c, or javascript. It is difficult to believe that php's behavior could be an intentional language feature. The problem can be solved by inserting nested parenthesis, so the parser's notion of operator precedence is implicated. Although changing it to work more like other languages *could* break some existing php code, this seems very unlikely. It could actually fix some unfound bugs. Please, if you don't change the implementation, at least make the manual explain how the ternery operator's parsing precedence works. (with a big warning) Reproduce code: --------------- <? $p = 1; $out = ($p < 2) ? '< 2' : ($p > 4) ? '> 4' : '= $p'; echo "$p $out\n"; ?> Expected result: ---------------- 1 < 2 Actual result: -------------- 1 > 4 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=36832&edit=1