smithaapc's trueRound() function is also broken. For
example:
trueRound(1.11, 3) //returns 1.1, should return 1.11
Here's a function that uses PHP's round() to calculate
significant figures:
<?php
function sigFig($value, $sigFigs) {
$exponent = floor(log10($value) + 1);
$significand = $value / pow(10, $exponent);
$significand = round($significand * pow(10, $sigFigs)) /
pow(10, $sigFigs);
$value = $significand * pow(10, $exponent);
return($value);
}
//Examples
sigFig(123.45, 6); // 123.45 (doesn't pad with zeros)
sigFig(123.45, 5); // 123.45
sigFig(123.45, 4); // 123.5
sigFig(123.45, 3); // 123
sigFig(123.45, 2); // 120 (rounds to 2 figures)
sigFig(123.45, 1); // 100
sigFig(123.45, 0); // 0 (!)
?>
----
Server IP: 87.124.64.96
Probable Submitter: 84.93.218.9
----
Manual Page -- http:
//www.php.net/manual/en/function.round.php
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