note 97722 deleted from function.bcadd by danbrown

Note Submitter: Gemorroj ---- the code was formated and the bug from the previous post was fixed: if variables $Num1 and $Num2 are not float numerics and where variable $Scale = 0 <?php class Math { static public function add ($num1, $num2, $scale = null) { // check if they're valid positive numbers, extract the whole numbers and decimals if (!preg_match("/^\+?(\d+)(\.\d+)?$/", $num1, $tmp1) || !preg_match("/^\+?(\d+)(\.\d+)?$/", $num2, $tmp2)) { return('0'); } // this is where the result is stored $output = array(); // remove ending zeroes from decimals and remove point $dec1 = isset($tmp1[2]) ? rtrim(substr($tmp1[2], 1), '0') : ''; $dec2 = isset($tmp2[2]) ? rtrim(substr($tmp2[2], 1), '0') : ''; // calculate the longest length of decimals $dLen = max(strlen($dec1), strlen($dec2)); // if $Scale is null, automatically set it to the amount of decimal places for accuracy if ($scale === null) { $scale = $dLen; } // remove leading zeroes and reverse the whole numbers, then append padded decimals on the end $num1 = strrev(ltrim($tmp1[1], '0') . str_pad($dec1, $dLen, '0')); $num2 = strrev(ltrim($tmp2[1], '0') . str_pad($dec2, $dLen, '0')); // calculate the longest length we need to process $mLen = max(strlen($num1), strlen($num2)); // pad the two numbers so they are of equal length (both equal to $mLen) $num1 = str_pad($num1, $mLen, '0'); $num2 = str_pad($num2, $mLen, '0'); // process each digit, keep the ones, carry the tens (remainders) for ($i = 0; $i < $mLen; ++$i) { $sum = ((int)$num1[$i] + (int)$num2[$i]); if (isset($output[$i])) { $sum += $output[$i]; } $output[$i] = $sum % 10; if ($sum > 9) { $output[$i + 1] = 1; } } // convert the array to string and reverse it $output = strrev(implode('', $output)); // substring the decimal digits from the result, pad if necessary (if $scale > amount of actual decimals) // next, since actual zero values can cause a problem with the substring values, if so, just simply give '0' // next, append the decimal value, if $scale is defined, and return result $decimal = str_pad(substr($output, -$dLen, $scale), $scale, '0'); $output = (($mLen - $dLen < 1) ? '0' : ($dLen ? substr($output, 0, -$dLen) : $output)); $output .= (($dLen && $scale > 0) ? '.' . $decimal : ''); return $output; } } ?>