PHP foreach equivalent

Volebab

In PHP we have foreach with a '=>' keyword that translates the key and value into a variable, for example:

$arr = [
	'foo' => [
		'bar',
		'biz'
	]
];

foreach($arr as $key => $value)
{
	// key = foo
	// value = array with bar and biz.
}

How can I translate this to Qt?

SGaist

Hi,

You don't translate it to Qt. Qt is C++.

If you are using C++11 you can use the range for loop

kshegunov

@Volebab
Or if you're not using C++11, you can use the foreach macro that Qt defines (if not disabled explicitly):

QList<QString> listOfStrings;
listOfStrings << "String 1" << "String 2" << "String 3";

foreach (QString string, listOfStrings)  {
     // ...
}

Volebab

@SGaist I know that, the question wasn't that, the question as related to translate the key and value using foreach as PHP does. - Your answer and the @kshegunov answer is foreach with values only.

SGaist

What container are you using ?

Volebab

I'm using QHash.

I tried using like this:

    for (const auto& kv : iter) {
        qDebug() << kv;
    }

But I can't get the key.

kshegunov

@Volebab
Just use the regular for loop:

typedef QHash<QString, QString> MyHash;

MyHash container;
for (MyHash::Iterator i = container.begin(), end = container.end(); i != end; i++)  {
    QString key = i.key(), value = i.value();
}

Kind regards.

Volebab

@kshegunov Amazing, thank you.

MajidKamali

@Volebab

QHash<QString, QString> hash;
foreach (auto key, hash.keys()) {
    qDebug() << hash[key];
}