TempFSFile: Use a WeakMap for reference tracking if available

Use a WeakMap to track references to TempFSFile instances if available
to avoid deprecation warnings for dynamic property creation on PHP 8.2.
Use an anonymous class rather than an stdClass to test the behavior in
TempFSFileTestTrait to verify that bind() does not trigger dynamic
property creation on PHP 8.2.

Also add a Phan stub for WeakMap for PHP 7.4.

Bug: T324894
Change-Id: Ic413c115e9ed1c750e175152094f3309628e777a

1 files changed, 24 insertions, 0 deletions

diff --git a/.phan/stubs/WeakMap.php b/.phan/stubs/WeakMap.php
new file mode 100644
index 000000000000..309c50c72b5a
--- /dev/null
+++ b/.phan/stubs/WeakMap.php
@@ -0,0 +1,24 @@
+<?php
+
+// Phan stub for PHP 8.0's WeakMap class
+
+ final class WeakMap implements ArrayAccess, Countable, IteratorAggregate {
+
+	public function count(): int {
+	}
+
+	public function getIterator(): Iterator {
+	}
+
+	public function offsetExists( object $object ): bool {
+	}
+
+	public function offsetGet( object $object ): mixed {
+	}
+
+	public function offsetSet( object $object, mixed $value ): void {
+	}
+
+	public function offsetUnset( object $object ): void {
+	}
+ }