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<?php function uppercase(Traversable $in) { foreach ($in as $word) { yield strtoupper($word); } } function each_println(Traversable $in) { foreach ($in as $line) { echo "$line\n"; } } each_println(uppercase(new ArrayIterator(["foo", "bar", "baz"])));
Output for git.master, git.master_jit, rfc.property-hooks
FOO BAR BAZ

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