#44934 [Opn->Fbk]: The parser doesn't parse a comma

ID: 44934 Updated by: jani@php.net -Summary: The parser doesn't parse a comma (ternary operator enhancement) Reported By: php at hristov dot com -Status: Open +Status: Feedback Bug Type: Feature/Change Request Operating System: All PHP Version: 5.3CVS-2008-05-07 (CVS) New Comment: What exactly is supposed to happen with that php code above? I mean, whatta hell is $b = ($a, 1); supposed to do? Previous Comments: ------------------------------------------------------------------------ [2008-05-07 14:55:23] andrey@php.net To make it even easier for testing : ./php -r '$a=1; $b = ($a, 2);' The equivalent in C is: #include <stdio.h> int main(void) { int a = 1, c; c = (a, 2); printf("%d\n", c); } "," has lower prio than =, thus the brackets. ------------------------------------------------------------------------ [2008-05-07 14:47:42] andrey@php.net If introduced while not completely? ------------------------------------------------------------------------ [2008-05-07 14:26:17] colder@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. The ternary operator is not supposed to support that syntax, and it doesn't. So this is not a bug, and I'm not sure it's a good feature request either: ternary syntax is suited for simple cases. But if you really think it should be implemented, file a feature request. ------------------------------------------------------------------------ [2008-05-07 11:52:37] php at hristov dot com Description: ------------ In the following case the parser bails out: php -r 'echo true? $t++,"true":"false";' with Parse error: syntax error, unexpected ',' in Command line code on line 1 The following mini-C program however does compile, although gcc is kind of stupid to realize that there should be no warning: #include <stdio.h> int main(void) { int t=0, f=0; printf("%s\n", (1==1) ? t++,"True":"False"); } andrey@whirlpool:~/dev> gcc -o a a.c andrey@whirlpool:~/dev> ./a True The comma does work however when used in a for() loop : andrey@whirlpool:~/dev> php -r 'for($i=0; $a++, $i < 2; $i++) echo "-"; echo "\n";' -- Reproduce code: --------------- php -r 'echo true? $t++,"true":"false";' Expected result: ---------------- true ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=44934&edit=1