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@ 2014-06-04T14:31:38Z

<?php
$array = range(0, 1440);

$it = new CallbackFilterIterator(
    	new ArrayIterator($array), 
    	function($value, $key) { return 0 === $key % 30; }
); 

foreach ($it as $value) { 
    var_dump($value);
}

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
range: documentation ( source)

preferences:dark modelive preview

40.46 ms | 402 KiB | 5 Q