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Need Help Real Fast [php]


darkside92
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For Class (high school) i need to make a simple php calcualtor i have it made just cant figure out this error neither can anyone else =/

heres the error Parse error: syntax error, unexpected T_VARIABLE in C:\xampp\htdocs\php_sandbox\math2.php on line 29

<html>
    <head>
        <title>Untitled Document</title>
    </head>

    <body>
    
    
    <html>
<body>

<form action="$_PHP[SELF]" method="get">
<input type="text" name="num1" />
<select name="sign">
  <option value="*">*</option>
  <option value="-">-</option>
  <option value="+">+</option>
</select>
<input type="text" name="num2" />
<input type="submit" />
</form>

<?php



if($_GET[sign]) {

$val = $_GET[$num1] $_GET[$sign] $_GET[$num2];

echo $val;
}
?>
</body>
</html>
    
    
    </body>
</html>

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$val = $_GET[$num1] $_GET[$sign] $_GET[$num2];

That statement has no logic whatsoever, you'd have to do something like

extract($_GET);
if ($sign == "+")
{
    $val = $num1 + $num2;
} 
elseif ($sign == "-") 
{
    $val = $num1 - $num2;
}

etc...

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<html>
    <head>
        <title>PHP Calculator</title>
    </head>
    <body>
    
   

<form action=<?php echo $_SERVER['PHP_SELF']; ?> method="POST">
<input type="text" name="num1" />
<select name="sign">
  <option value="*">*</option>
    <option value="/">/</option>
  <option value="-">-</option>
  <option value="+">+</option>
</select>
<input type="text" name="num2" />
<input type="submit" />
</form>

<?php
$multi = "*";
$plus = "+";
$min = "-";
$div = "/";

if($_POST['sign'] == $multi) {
$val = ($_POST['num1'] * $_POST['num2']);
echo $_POST['num1'].$_POST['sign'].$_POST['num2']."=".$val;
}

if($_POST['sign'] == $plus) {
$val = ($_POST['num1'] + $_POST['num2']);
echo $_POST['num1'].$_POST['sign'].$_POST['num2']."=".$val;
}

if($_POST['sign'] == $min) {
$val = ($_POST['num1'] - $_POST['num2']);
echo $_POST['num1'].$_POST['sign'].$_POST['num2']."=".$val;
}

if($_POST['sign'] ==     $div) {
$val = ($_POST['num1'] / $_POST['num2']);
echo $_POST['num1'].$_POST['sign'].$_POST['num2']."=".$val;
}



?>
</body>
</html>

I do things the long way, but yeah, it still works. Clean it up and make one function instead of 4.

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