Bug #75312 [NEW]: inconsistent duck-typing with typed variadic arguments

From: michelv+php at gmail dot com Operating system: all PHP version: 7.1.10 Package: Scripting Engine problem Bug Type: Bug Bug description:inconsistent duck-typing with typed variadic arguments Description: ------------ Typed variadic arguments are now possible, but it looks like some duck-typing is still going on, because you can use integers or booleans for arguments like string ...$args. However you can not use null, that results in a fatal error. If duck-typing should not happen at all, being able to use anything other than a string in that case is a bug. If duck-typing is expected, then it's not working like it does in other parts of PHP, where null is accepted. Test script: --------------- <?php function vsprintfProxy(string $format, string ...$args): string { return vsprintf($format, $args); } var_export(vsprintf('%s', [42])); var_export(vsprintfProxy('%s', 42)); echo "\n"; var_export(vsprintf('%s', [false])); var_export(vsprintfProxy('%s', false)); echo "\n"; var_export(vsprintf('%s', [null])); var_export(vsprintfProxy('%s', null)); echo "\n"; Expected result: ---------------- '42''42' '''' '''' Actual result: -------------- '42''42' '''' '' Fatal error: Uncaught TypeError: Argument 2 passed to vsprintfProxy() must be of the type string, null given, called in /in/pNqSi on line 17 and defined in /in/pNqSi:3 Stack trace: #0 /in/pNqSi(17): vsprintfProxy('%s', NULL) #1 {main} thrown in /in/pNqSi on line 3 Process exited with code 255. -- Edit bug report at https://bugs.php.net/bug.php?id=75312&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75312&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75312&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75312&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75312&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75312&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75312&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75312&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75312&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75312&r=support Expected behavior: https://bugs.php.net/fix.php?id=75312&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75312&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75312&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75312&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75312&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75312&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75312&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75312&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75312&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75312&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75312&r=mysqlcfg