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<?php function generator() { for($i = 0 ; $i <= 20 ; $i++) { yield $i; } } $generator = generator(); $callback = function($value) { return !($value % 2); }; foreach(new CallbackFilterIterator($generator , $callback) as $value) { echo $value."\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
0 2 4 6 8 10 12 14 16 18 20

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