How to solve an elseif that needs to be exclusive?

Question

How to solve an elseif that needs to be exclusive?

Asked 8 years, 6 months ago

Viewed 75 times

6

I want to create a page where when a checkbox is marked, a message is printed, but if all checkbox are marked, print another message.

<!DOCTYPE html>
<html lang="pt-br">
    <head>
        <title>Form de exemplo com checkboxes</title>
        <meta charset="utf-8">
    </head>
    <body>
        <form action="" method="post">
            <p>
                <input type="checkbox" name="bike" value="on">eu tenho uma bike
            </p>
            <p>
                <input type="checkbox" name="car" value="on">eu tenho um carro
            </p>
            <p>
                <input type="submit" value="RLRLRLRL" />
            </p>
        </form>
    </body>
</html>
<?PHP
#$_POST['bike'] = ( isset($_POST['bike']) ) ? true : null;
#$_POST['car']  = ( isset($_POST['car']) )  ? true : null;
#var_dump($_POST);

$bike = $_POST['bike'];
$car = $_POST['car'];
if($bike) {
    echo "Olar, eu tenho uma bike";
} elseif ($car) {
    echo "Olar, eu tenho um carro";
} elseif ($car || $bike) {
    echo "Olar, eu tenho os dois";
}

?>

I have both, it means both, so it’s not one ou and yes a e(&&)

– rray

2015/12/15 at 19:14

2 answers

5

In this particular case the first two conditions are wrong, because it must be executed only if it can be exclusive, then the condition has to ensure that it has nothing else. There is an error in the latter because it will print if you have either, and not both, solution:

if ($bike && !$car) {
    echo "Olar, eu tenho uma bike";
} elseif ($car && !$bike) {
    echo "Olar, eu tenho um carro";
} elseif ($car && $bike) {
    echo "Olar, eu tenho os dois";
}

I put in the Github for future reference.

There are other ways to solve this, but this is as close as you wrote.

And in the situation of having several items ? I will always have to list all of them and sort manually (!$) ?

– André

2015/12/15 at 19:20
Then the logic would probably have to be different, I answered what you asked, for another problem, the answer would be different. Maybe the solution is to do something very different. But it’s always complicated to say something if the requirements are not well defined - and they make sense, of course. Did you ever think the last sentence doesn’t make sense? "I have both" what? It doesn’t solve a real problem.

– Maniero

2015/12/15 at 19:22

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by rray • **66,288** points · Answer 1 · 2015-12-15T19:30:18+00:00

Since the values of checkboxs are the same, another way to solve this is to combine array_keys() to get all values keys(on) found, and check the amount with count().

//equivalente os checkboxs marcados pelo $_POST
$itens = ['bike' => 'on', 'car' => 'on'];
//$itens = ['bike' => 'on']; //outro teste
$marcados = array_keys($itens, 'on');

if(count($marcados) === 1 ){
    echo 'eu tenho '. $marcados[0];
}else if(count($marcados) === 2){
    echo 'tenho ambos, bike e carro';
}