Declare tentative return types for ext/spl - part 1

Zend/tests/foreach_004.phpt

@@ -16,10 +16,10 @@ class IT extends ArrayIterator {
         }
     }
 
-    function rewind()  {$this->trap(__FUNCTION__); return parent::rewind();}
-    function valid()   {$this->trap(__FUNCTION__); return parent::valid();}
-    function key()     {$this->trap(__FUNCTION__); return parent::key();}
-    function next()    {$this->trap(__FUNCTION__); return parent::next();}
+    function rewind(): void  {$this->trap(__FUNCTION__); parent::rewind();}
+    function valid(): bool   {$this->trap(__FUNCTION__); return parent::valid();}
+    function key(): mixed    {$this->trap(__FUNCTION__); return parent::key();}
+    function next(): void    {$this->trap(__FUNCTION__); parent::next();}
 }
 
 foreach(['rewind', 'valid', 'key', 'next'] as $trap) {

Zend/tests/iterator_key_by_ref.phpt

@@ -3,6 +3,7 @@ Iterator::key() with by-ref return
 --FILE--
 <?php
 class Test extends ArrayIterator {
+    #[ReturnTypeWillChange]
     function &key() {
         return $foo;
     }

ext/phar/tests/phar_oo_004.phpt

@@ -31,31 +31,31 @@ class MyDirectoryIterator extends DirectoryIterator
         parent::__construct($dir);
     }
 
-    function rewind()
+    function rewind(): void
     {
         echo __METHOD__ . "\n";
         parent::rewind();
     }
 
-    function valid()
+    function valid(): bool
     {
         echo __METHOD__ . "\n";
         return parent::valid();
     }
 
-    function key()
+    function key(): mixed
     {
         echo __METHOD__ . "\n";
         return parent::key();
     }
 
-    function current()
+    function current(): mixed
     {
         echo __METHOD__ . "\n";
         return parent::current();
     }
 
-    function next()
+    function next(): void
     {
         echo __METHOD__ . "\n";
         parent::next();

ext/phar/tests/phar_oo_008.phpt

@@ -31,45 +31,47 @@ foreach($f as $k => $v)
 
 class MyCSVFile extends SplFileObject
 {
-    function current()
+    function current(): array|false
     {
         return parent::fgetcsv(',', '"');
     }
 }
 
 $phar->setInfoClass('MyCSVFile');
+/** @var MyCSVFile $v */
 $v = $phar['a.csv'];
 
 echo "===3===\n";
 while(!$v->eof())
 {
-    echo $v->key() . "=>" . join('|',$v->fgetcsv()) . "\n";
+    echo $v->key() . "=>" . join('|', $v->fgetcsv()) . "\n";
 }
 
 echo "===4===\n";
 $v->rewind();
 while(!$v->eof())
 {
     $l = $v->fgetcsv();
-    echo $v->key() . "=>" . join('|',$l) . "\n";
+    echo $v->key() . "=>" . join('|', $l) . "\n";
 }
 
 echo "===5===\n";
 foreach($v as $k => $d)
 {
-    echo "$k=>" . join('|',$d) . "\n";
+    echo "$k=>" . join('|', $d) . "\n";
 }
 
 class MyCSVFile2 extends SplFileObject
 {
-    function getCurrentLine()
+    function getCurrentLine(): string
     {
         echo __METHOD__ . "\n";
         return implode('|', parent::fgetcsv(',', '"'));
     }
 }
 
 $phar->setInfoClass('MyCSVFile2');
+/** @var MyCSVFile2 $v */
 $v = $phar['a.csv'];
 
 echo "===6===\n";