[SOLVED] unexpected T_LNUMBER

[The Little Guy]

$problem = $_GET['problem'];   // equals 4+8=y
$solveFor = $_GET['solve'];
$vals = str_split($problem);
//print_r($vals);
$str = '';
foreach($vals as $val){
if($val != '='){
	$str .= $val.' ';
}else{break;}
}
$str .= ';';
$v = eval($str);
echo $v;

 

Why do I get this: Parse error: syntax error, unexpected T_LNUMBER in /home/.marble/ryannaddy/homework.phpsnips.com/process/algerbra.php(13) : eval()'d code on line 1