Bug #69889 [Asn->Csd]: Null coalesce operator doesn't work for string offsets

Edit report at https://bugs.php.net/bug.php?id=69889&edit=1 ID: 69889 Updated by: nikic@php.net Reported by: me at kelunik dot com Summary: Null coalesce operator doesn't work for string offsets -Status: Assigned +Status: Closed Type: Bug Package: *General Issues PHP Version: 7.0.0alpha1 Assigned To: nikic Block user comment: N Private report: N New Comment: Automatic comment on behalf of nikic Revision: http://git.php.net/?p=php-src.git;a=commit;h=9fa70dbd29f91c9ae9360f19c63ada18268f5b17 Log: Fixed bug #69889 Previous Comments: ------------------------------------------------------------------------ [2015-06-20 13:04:07] laruence@php.net the problem is foo[5] returns a empty string, later in ZEND_COALESCE operands, it have no idea it whether it is a valid return.. instead of change uninitlized offset from empty string to IS_NULL(BC break?), we could also introduce a CG(error_empty_string) use in such case.. thanks ------------------------------------------------------------------------ [2015-06-20 12:16:15] me at kelunik dot com Description: ------------ http://3v4l.org/lsoFA Test script: --------------- <?php $foo = "test"; var_dump($foo[0] ?? "default"); var_dump($foo[5] ?? "default"); var_dump(isset($foo[5]) ? $foo[5] : "default"); Expected result: ---------------- string(1) "t" string(7) "default" string(7) "default" Actual result: -------------- string(1) "t" string(0) "" string(7) "default" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69889&edit=1