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<?php class A implements IteratorAggregate { public $b; public function __construct(B $b) { $this->b = $b; } public function getIterator() { return $b; } } class B implements IteratorAggregate { public function getIterator() { for ($i = 0; $i < 5; $i++) { yield $i => $i; } } } $a = new A(new B); foreach ($a as $key => $value) { var_dump($key, $value); }
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of A::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Z88RT on line 8 Deprecated: Return type of B::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Z88RT on line 14 Warning: Undefined variable $b in /in/Z88RT on line 9 Fatal error: Uncaught Exception: Objects returned by A::getIterator() must be traversable or implement interface Iterator in /in/Z88RT:23 Stack trace: #0 {main} thrown in /in/Z88RT on line 23
Process exited with code 255.

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