PHP GET，if / else [关闭]

Question

What's wrong with this code:

<?php
if ($_GET['variable'] == "a") {
    $variable = "a";
}
else {
    $variable = "b" 
}
echo $variable;
?>

I get an internal server error.

Answer 1

<?php
$variable = 'b';
if (isset($_GET['hop']) && $_GET['hop'] == "a")
{
    $variable = 'a';
}

echo $variable;
?>

For an explanation on what you did wrong look here: http://php.net/manual/en/getting-started.php