ext/spl: Add ArrayObject test with property hooks

ext/spl/tests/ArrayObject/property_hooks.phpt

@@ -0,0 +1,84 @@
+--TEST--
+ArrayObject with property hooks
+--FILE--
+<?php
+
+class TestHooks
+{
+    private bool $isModified = false;
+    public string $first {
+        get {
+            return strtoupper($this->first);
+        }
+    }
+
+    public function __construct(string $first, public string $last) {
+        $this->first = $first;
+    }
+
+    public string $fullName {
+        // Override the "read" action with arbitrary logic.
+        get => $this->first . " " . $this->last;
+
+        // Override the "write" action with arbitrary logic.
+        set {
+            [$this->first, $this->last] = explode(' ', $value, 2);
+            $this->isModified = true;
+        }
+    }
+
+    public string $username {
+        set(string $value) {
+            if (strlen($value) > 10) throw new \Exception('Too long');
+            $this->username = strtolower($value);
+        }
+    }
+}
+
+$o = new TestHooks('first', 'last');
+$a = new ArrayObject($o);
+
+echo 'Check object properties directly', PHP_EOL;
+var_dump($o->first);
+var_dump($o->last);
+var_dump($o->fullName);
+
+echo 'Check object properties via ArrayObject index', PHP_EOL;
+var_dump($a['first']);
+var_dump($a['last']);
+var_dump($a['fullName']);
+var_dump($a['username']);
+
+echo 'Write to object properties via ArrayObject index', PHP_EOL;
+$a['first'] = 'ArrayObject';
+$a['last'] = 'ArrayObject';
+$a['fullName'] = 'ArrayObject is hell';
+$a['username'] = 'whatever_hooks_do_not_matter';
+
+echo 'Check object properties directly', PHP_EOL;
+var_dump($o->first);
+var_dump($o->last);
+var_dump($o->fullName);
+var_dump($o->username);
+
+?>
+--EXPECTF--
+Check object properties directly
+string(5) "FIRST"
+string(4) "last"
+string(10) "FIRST last"
+Check object properties via ArrayObject index
+string(5) "first"
+string(4) "last"
+
+Warning: Undefined array key "fullName" in %s on line %d
+NULL
+
+Warning: Undefined array key "username" in %s on line %d
+NULL
+Write to object properties via ArrayObject index
+Check object properties directly
+string(11) "ARRAYOBJECT"
+string(11) "ArrayObject"
+string(23) "ARRAYOBJECT ArrayObject"
+string(28) "whatever_hooks_do_not_matter"