bu şekilde bir deneyip sonucu buraya yazınız.
<html><head><title>Calculation Result</title></head>
<body>
<?php
$sayi1 = $_POST["sayi1"];
$sayi2 = $_POST["sayi2"];
$islem = $_POST["islem"];
if( is_numeric($sayi1) && is_numeric($sayi2) ) {
if ($islem == 'choose') {
echo "Please choose an operation.<br />
<b><a href='index.php'>Back</a></b>";
}
else if ($islem == 'sub'){
$sonuc = $sayi1 - $sayi2;
echo "The result is <b>".$sonuc.".</b><br /><a href='index.php'>Back</a>";
} else if ($islem == 'add'){
$sonuc = $sayi1 + $sayi2;
echo "The result is <b>".$sonuc.".</b><br /><a href='index.php'>Back</a>";
} else if ($islem == 'mul'){
$sonuc = $sayi1 * $sayi2;
echo "The result is <b>".$sonuc.".</b><br /><a href='index.php'>Back</a>";
} else if($islem == 'div'){
$sonuc = $sayi1 / $sayi2;
echo "The result is <b>".$sonuc.".</b><br /><a href='index.php'>Back</a>";
} else{ echo("Invalid entry - please retry");
}
}
?>