bcadd

I made this to add an unlimited size of numbers together..
This could be useful for those without the BCMath extension.
It allows decimals, and optional $Scale parameter. If $Scale isn't specified, then it'll automatically adjust to show the correct number of decimals.
<?php
function Add($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-$DLen<1)?'0':substr($Output,0,-$DLen));
 $Output.=(($Scale>0)?".{$Decimal}":'');
 return($Output);
}
$A="5650175242.508133742";
$B="308437806.831153821478770";
printf(" Add(%s,%s);\r\n// %s\r\n\r\n",$A,$B, Add($A,$B));
printf("BCAdd(%s,%s);\r\n// %s\r\n\r\n",$A,$B,BCAdd($A,$B));
/*
 This will produce the following..
 Add(5650175242.508133742,308437806.831153821478770);
 // 5958613049.33928756347877
 BCAdd(5650175242.508133742,308437806.831153821478770);
 // 5958613049
*/
?>

It was a fun experience making, and thought I'd share it.
Enjoy,
Nitrogen.

Be aware:
$exp1 = "1E5";
$exp2 = "2E4";
$ans1 = bcadd((float)$exp1, (float)$exp2, 3);
$ans2 = bcadd((int)$exp1, (int)$exp2, 3);
$ans3 = bcadd($exp1, $exp2, 3);
echo "1: $exp1 + $exp2 = $ans1\r\n";
echo "2: $exp1 + $exp2 = $ans2\r\n";
echo "3: $exp1 + $exp2 = $ans3\r\n";
1: 1E5 + 2E4 = 120000.000
2: 1E5 + 2E4 = 3.000
3: 1E5 + 2E4 = 0.000