(php/Laravel) How do I calculate mathematical expressions?

Question

I need to do shape calculations with php, for example, I will have a field in which I will put the 2 + 9 (4 * 8) / 6 and return the result, but I have no idea how to do. Here’s an example of how much I need:

http://pt.numberempire.com/equationsolver.php/equationsolver.php#menu

Answer 1

I leave here a way without using eval(), for this already has an answer that was made longer ago whose @Bacco put the link on top of the question:

function callback1($m) {return c($m[1]);}
function callback2($n,$m) {
    $o=$m[0];
    $m[0]=' ';
    return $o=='+' ? $n+$m : ($o=='-' ? $n-$m : ($o=='*' ? $n*$m : $n/$m));
}
function c($s){ 
    while ($s != ($t = preg_replace_callback('/\(([^()]*)\)/','callback1',$s))) $s=$t;
        preg_match_all('![-+/*].*?[\d.]+!', "+$s", $m);
        return array_reduce($m[0], 'callback2');
}

$str = '(3 + 2) * 5';
echo c($str);

DEMONSTRATION

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