Bug #79382 [Com]: Fatal error: Cannot redeclare getallheaders() in ...

Edit report at https://bugs.php.net/bug.php?id=79382&edit=1 ID: 79382 Comment by: bugreports at gmail dot com Reported by: admin at franceserv dot fr Summary: Fatal error: Cannot redeclare getallheaders() in ... Status: Open Type: Bug Package: *General Issues Operating System: Linux PHP Version: 7.3.15 and 7.4 Block user comment: N Private report: N New Comment: > It seems to me that function_exists() should return true, > even if the function is disabled only if you provide a dedicated function or trow exceptions when disabled functions are called because otherwise you can't write any code which handles the situation correctly Previous Comments: ------------------------------------------------------------------------ [2020-03-17 12:07:15] cmb@php.net It seems to me that function_exists() should return true, even if the function is disabled. ------------------------------------------------------------------------ [2020-03-17 09:16:39] nikic@php.net This is a pretty interesting case. I'm not sure what the correct behavior for this is. Should we be allowing redefinition of disabled functions? Might be rather problematic technically. Things would be a lot clearer here if disabled functions were simply completely removed, rather than replaced with a dummy implementation. ------------------------------------------------------------------------ [2020-03-14 14:27:14] bugreports at gmail dot com that would also work better if you don't want a seperated include file which could be thrown away all togehter after deciding no longer support anything below PHP 7.3 on newer php versions this would also optimized out completly and avoid the issue of that bugreport as well as the terrible runtime overhead of function_exists() if(PHP_VERSION_ID < 70300)) { function getallheaders() { } } ------------------------------------------------------------------------ [2020-03-14 14:22:39] bugreports at gmail dot com "disable_functions" should throw an exception when a disabled function is called so one can handle it proper without spread *slow and expensive* function exists into the codebase - try/catch is much faster in cases where it don't throw such compat layers defining a function which is part of a newer php release should go into a include file because code like below would be completly optimized out by opcache given the constant nature known at "compile time" if(PHP_VERSION_ID < 70300) { require 'php73.inc.php'; } ------------------------------------------------------------------------ [2020-03-14 14:14:34] admin at franceserv dot fr This strange behavior seem to exist since 13 years at least : https://www.php.net/manual/fr/function.function-exists.php#67947 When a function is disabled, if we check this function with function_exists() it's reply "don't exist", but if we are trying to declare the function it's reply "exist already". Funny :) ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=79382 -- Edit this bug report at https://bugs.php.net/bug.php?id=79382&edit=1