Eval on edited string from database

programming
1

Hey all,
I’ve been working on this little script to replace values in a stored equation (database) with actual numbers and then running the equation. But all I keep getting is just the script echoing out the string instead of evaluating it.

I know what I’m going to post is kinda long and the script isn’t complete yet. It’s just a proof of concept before I move forward with a larger portion of the project. any help would be much appreciated:)


$eq = 10*5 / p1.str + p1.dex / p1.chr;

replaceHoldersWithVals(createStatArr(getHolders($eq)),$eq);
	
	function getHolders($str)
	{
		$statArr = array();
		$pos = 0;
		$i = 0;
		$len = strlen($str);
		while($i != strlen($str))
		{
			if(stripos($str,"p1",$pos))
			{
				$pos = stripos($str,"p1",$pos);
				array_push($statArr,substr($str,$pos+3,3));
				$pos += 6;
			}else{
				$i = $len; 
			}
		}
		return $statArr;
	}
	
	function createStatArr($statArr)
	{
		for($i = 0; $i < count($statArr);$i++)
		{
			switch($statArr[$i])
			{
				case "str":
					{
						$statArr[$i] = array("str"=>10);
						break;
					}
				case "dex":
					{
						$statArr[$i] = array("dex"=>7);
						break;
					}
				case "chr":
					{
						$statArr[$i] = array("chr"=>2);
						break;
					}
			}
		}
		
		return $statArr;
	}
	
	function replaceHoldersWithVals($statArr, $str)
	{
		$pos = 0;
		$len = strlen($str);
		for($i = 0; $i < count($statArr);$i++)
		{
			$str = str_ireplace("p1.".key($statArr[$i]),$statArr[$i][key($statArr[$i])],$str);
		}
		eval("\$e = \"$str\";");
		echo $e;
	}