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--TEST-- stats_harmonic_mean() tests --FILE-- <?php var_dump(sprintf("%2.9f", stats_harmonic_mean(array(1,3,5,7)))); var_dump(stats_standard_deviation(array())); ?> --EXPECTF-- string(11) "2.386363636" Warning: stats_standard_deviation(): The array has zero elements in %s on line %d bool(false)