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<?php function string_key_iterator() { yield '42' => 'magic'; } function magical_varargs(...$whatever) { return $whatever; } echo "Normal:\n"; $normal_array = iterator_to_array(string_key_iterator()); var_dump( isset($normal_array[42]), isset($normal_array["42"]), array_keys($normal_array) ); echo "\nWeird and broken:\n"; $freaky_array = magical_varargs(...string_key_iterator()); var_dump( isset($freaky_array[42]), isset($freaky_array["42"]), array_keys($freaky_array) );
Output for git.master_jit, git.master
Normal: bool(true) bool(true) array(1) { [0]=> int(42) } Weird and broken: bool(false) bool(false) array(1) { [0]=> string(2) "42" }

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