double round (double val [, int
precision])
Returns the rounded value of val to specified precision.
$foo = round (3.4); // $foo == 3.0
$foo = round (3.5); // $foo == 4.0
$foo = round (3.6); // $foo == 4.0
$foo = round (1.95583, 2); // $foo == 1.96
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