#50068 [Bgs]: const problem

ID: 50068 Updated by: scottmac@php.net Reported By: jachym dot tousek at gmail dot com Status: Bogus Bug Type: Scripting Engine problem Operating System: Windows 7 PHP Version: 5.3.1RC3 New Comment: const is a compile time constant and only allows simple scalar values. define is a constant resolved at runtime and it allows full expressions when being defined. Previous Comments: ------------------------------------------------------------------------ [2009-11-03 22:26:15] jachym dot tousek at gmail dot com Well i've checked [http://www.php.net/manual/en/language.constants.syntax.php] and also updated from 5.3.0 to 5.3.1RC3 before sending this report, but there is nothing about const name = 'value'; being different from define('name','value'); and i can not understand it even now. ------------------------------------------------------------------------ [2009-11-03 21:46:58] felipe@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 ------------------------------------------------------------------------ [2009-11-03 21:11:32] ksingla@php.net I think this behavior is by design. const expressions are evaluated at compile time. So only few operations are supported in a const expression and string concatenation is not one of those. I could repro this in PHP 5.2 (after putting it under a class). ------------------------------------------------------------------------ [2009-11-03 20:16:44] jachym dot tousek at gmail dot com Description: ------------ const is not working Reproduce code: --------------- <?php const ROOT_DIR = __DIR__ . '/..'; //parse error <?php define('ROOT_DIR',__DIR__ . '/..'); //works fine ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=50068&edit=1