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float round ( float val [, int precision] )

<?php
echo round(3.4);         // 3
echo round(3.5);         // 4
echo round(3.6);         // 4
echo round(3.6, 0);      // 4
echo round(1.95583, 2);  // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2);    // 5.05
echo round(5.055, 2);    // 5.06
?>

<?php
$num=0.0215489;
echo sprintf("%.3f", $num); // 0.022

$num2 = 123213.066666;
echo sprintf("%.2f", $num2); // 123213.07
?>