Bug #55278 [Dup]: @ (Error control/suppression) operator prevents creation of variable

Edit report at https://bugs.php.net/bug.php?id=55278&edit=1 ID: 55278 User updated by: lucas at threeamdesign dot com Reported by: lucas at threeamdesign dot com -Summary: @ Error control operator prevents creation of variable +Summary: @ (Error control/suppression) operator prevents creation of variable Status: Duplicate Type: Bug Package: Scripting Engine problem Operating System: Windows 7 PHP Version: 5.3.6 Block user comment: N Private report: N New Comment: Made this bug easier to search for. Previous Comments: ------------------------------------------------------------------------ [2011-07-28 02:32:55] lucas at threeamdesign dot com Thanks, glad it wasn't just me. I did search for it but I'm not surprised I didn't find it - you can't search for "@" so I looked for "error control" and "error suppression" ------------------------------------------------------------------------ [2011-07-26 05:05:11] laruence@php.net this is a duplicate, see #47623 ------------------------------------------------------------------------ [2011-07-25 03:22:23] lucas at threeamdesign dot com Description: ------------ When a function is defined with a parameter that is passed by reference, calling the function with a variable that has not been previously set will create that variable (and trigger a warning). After the function is called that variable exists (won't trigger warnings) and holds null or whatever value the function assigned to it. If you try to suppress the warning for the variable that doesn't exist at call time, it will not be created, and trying to access it after the function triggers warnings. It works as expected if you suppress errors on the function call but this is not desirable because it will also hide other errors. Test script: --------------- <?php function foo(&$bar) { $bar = 'woo'; } @foo($x); foo(@$y); var_dump($x, $y); Expected result: ---------------- string(3) "woo" string(3) "woo" Actual result: -------------- Notice: Undefined variable: y in FILE on line LINE string(3) "woo" NULL ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=55278&edit=1