[b]Commify:[/b]
This function inserts a comma separator into every 3 digits. 
[i]For Example:[/i]
commify (100000);
Output will be: 100,000
<code lang="PHP">
function commify ($str) { 
        $n = strlen($str); 
        if ($n <= 3) { $return=$str; } 
        else { 
	$pre=substr($str,0,$n-3); 
	$post=substr($str,$n-3,3); 
	$pre=commify($pre); 
	$return="$pre,$post"; 
        }
        return($return); 
}
</code>

[b]Dollarfy:[/b]
Does the following things to a floating point number:
1. This function inserts a comma separator into every 3 digits. 
For example: 100000.1252 will be 100,000.1252.
2. Round to the decimal number to the next significant figure. 
For example: 100,000.1252 will be 100,000.13
3. Add a dollar sign to the number. 
For example: 100,000.13 will be $100,000.13
<code lang="PHP">
function dollarfy ($num,$dec) {
	$format="%.$dec" . "f";  
	$number=sprintf($format,$num);
	$str=strtok($number,".");
	$dc=strtok(".");      
	$str=commify($str);
	$return="\$".$str;
	if ($dec!=0) { $return = $return . "." . $dc; } 
	return($return); 
}
</code>