/**
* Surprisingly, the results of this implementation of round()
* prove better than the native PHP round(). For example, try:
* round(639.795, 2);
* round(267.835, 2);
* round(0.302515, 5);
* round(0.36665, 4);
* then try:
* IfwPsn_Vendor_Zend_Locale_Math::round('639.795', 2);
*/
public static function round($op1, $precision = 0)
{
if (self::$_bcmathDisabled) {
$op1 = round($op1, $precision);
if (strpos((string) $op1, 'E') === false) {
return self::normalize(round($op1, $precision));
}
}
if (strpos($op1, 'E') !== false) {
$op1 = self::floatalize($op1);
}
$op1 = trim(self::normalize($op1));
$length = strlen($op1);
if (($decPos = strpos($op1, '.')) === false) {
$op1 .= '.0';
$decPos = $length;
$length += 2;
}
if ($precision < 0 && abs($precision) > $decPos) {
return '0';
}
$digitsBeforeDot = $length - ($decPos + 1);
if ($precision >= $length - ($decPos + 1)) {
return $op1;
}
if ($precision === 0) {
$triggerPos = 1;
$roundPos = -1;
} elseif ($precision > 0) {
$triggerPos = $precision + 1;
$roundPos = $precision;
} else {
$triggerPos = $precision;
$roundPos = $precision - 1;
}
$triggerDigit = $op1[$triggerPos + $decPos];
if ($precision < 0) {
// zero fill digits to the left of the decimal place
$op1 = substr($op1, 0, $decPos + $precision) . str_pad('', abs($precision), '0');
}
if ($triggerDigit >= '5') {
if ($roundPos + $decPos == -1) {
return str_pad('1', $decPos + 1, '0');
}
$roundUp = str_pad('', $length, '0');
$roundUp[$decPos] = '.';
$roundUp[$roundPos + $decPos] = '1';
if ($op1 > 0) {
if (self::$_bcmathDisabled) {
return IfwPsn_Vendor_Zend_Locale_Math_PhpMath::Add($op1, $roundUp, $precision);
}
return self::Add($op1, $roundUp, $precision);
} else {
if (self::$_bcmathDisabled) {
return IfwPsn_Vendor_Zend_Locale_Math_PhpMath::Sub($op1, $roundUp, $precision);
}
return self::Sub($op1, $roundUp, $precision);
}
} elseif ($precision >= 0) {
return substr($op1, 0, $decPos + ($precision ? $precision + 1 : 0));
}
return (string) $op1;
}
public static function Scale($scale)
{
if ($scale > 9) {
require_once IFW_PSN_LIB_ROOT . 'IfwPsn/Vendor/Zend/Locale/Math/Exception.php';
throw new IfwPsn_Vendor_Zend_Locale_Math_Exception("can not scale to precision {$scale}", $scale, null, null);
}
self::$defaultScale = $scale;
self::$defaultPrecision = pow(10, -$scale);
return true;
}
