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<?php $result = []; function getNumsOdd(array $nums, array &$result) { foreach($nums as $num) { iterator_apply(get2Nums($num, $result),function(){yield;}); } } function get2Nums(array $nums, array &$result) { foreach($nums as $num) { if ($num % 2) { $result[$key] = $num; yield; } } } foreach(getNumsOdd([[1,3,4,5,6],[7,8,9,10]], $result) as $x); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $key in /in/R3ed8 on line 13 Warning: Undefined variable $key in /in/R3ed8 on line 13 Warning: Undefined variable $key in /in/R3ed8 on line 13 Warning: Undefined variable $key in /in/R3ed8 on line 13 Warning: Undefined variable $key in /in/R3ed8 on line 13 Warning: foreach() argument must be of type array|object, null given in /in/R3ed8 on line 19 Array ( [] => 9 )

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