Bug #80803 [Fbk->Opn]: socket_read() reference to global socket fails in user function

Edit report at https://bugs.php.net/bug.php?id=80803&edit=1 ID: 80803 User updated by: janui at onmat dot com Reported by: janui at onmat dot com Summary: socket_read() reference to global socket fails in user function -Status: Feedback +Status: Open Type: Bug Package: *Data Exchange functions Operating System: Linux 5.10.14-2-ARCH armv7l PHP Version: 8.0.2 Block user comment: N Private report: N New Comment: The text and script provided should be enough to explain the problem. I can provide you with a full example, but this will be far in excess of the 20 lines of code limit which you specify as a limit. You will also need to have a server process which will initiate a socket and reply to the test requests. Any socket server process will suffice. My current solution is fully tested and works with PHP7.4.13-1 (syntactically & run-time correct). As I already specified, the problem relates only to socket_read(), the other PHP8 socket functions work without problems. And the identical code for the socket_read() problem works correctly when executed directly in the calling script (also syntactically & run-time correct). Please specify which server proces you wish to use for testing/debugging and advise on the 20 lines limit. Previous Comments: ------------------------------------------------------------------------ [2021-02-26 15:39:36] requinix@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2021-02-26 11:02:37] janui at onmat dot com Description: ------------ --- From manual page: https://php.net/function.socket-read --- When a user function contains a socket_read() which references a globally defined socket object it fails to connect to and read the socket. When the same code used in the top-level script it works correctly. The problem is not present in the socket_connect(), socket_write() and socket_close() functions. function user_function_read_socket($socketVariableName) { $buff = 4096; global $$socketVariableName; echo $socketVariableName."\n"; var_dump($$socketVariableName); $response = socket_read($$socketVariableName, $buff, PHP_NORMAL_READ); echo $response."\n"; echo socket_strerror(socket_last_error($$socketVariableName))."\n"; } The following similar construction has no effect on the result: $response = socket_read($GLOBALS[$socketVariableName], $buff, PHP_NORMAL_READ); Test script: --------------- See description. A full test script can be delivered., something like this: <?php function user_function_open_socket($socketVariableName) {...} function user_function_write_socket($socketVariableName, $command) {...} function user_function_read_socket($socketVariableName) {...see description...} function user_function_close_socket($socketVariableName) {...} $socketVariableName = 'testSocketName'; $command = 'a valid command'; user_function_open_socket($socketVariableName); user_function_write_socket($socketVariableName, $command); user_function_read_socket($socketVariableName); // paste the code from the read function here user_function_close_socket($socketVariableName); Expected result: ---------------- I would expect the code to work in the same way regardless of being used in the top level script as in a user function. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80803&edit=1