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Nikita Popov b10416a652 Deprecate passing null to non-nullable arg of internal function

This deprecates passing null to non-nullable scale arguments of
internal functions, with the eventual goal of making the behavior
consistent with userland functions, where null is never accepted
for non-nullable arguments.

This change is expected to cause quite a lot of fallout. In most
cases, calling code should be adjusted to avoid passing null. In
some cases, PHP should be adjusted to make some function arguments
nullable. I have already fixed a number of functions before landing
this, but feel free to file a bug if you encounter a function that
doesn't accept null, but probably should. (The rule of thumb for
this to be applicable is that the function must have special behavior
for 0 or "", which is distinct from the natural behavior of the
parameter.)

RFC: https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg

Closes GH-6475.

2021-02-11 21:46:13 +01:00

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 --TEST--
 Bug #46051 (SplFileInfo::openFile - memory overlap)
 --FILE--
 <?php
 $x = new splfileinfo(__FILE__);
 try {
     $x->openFile("", false, []);
 } catch (TypeError $e) { }
 var_dump($x->getPathName());
 ?>
 --EXPECTF--
 string(%d) "%sbug46051.php"