如何在yii2 Yii中使用位置占位符:t()；

Yii::t($category, $message, $params = [], $language = null)

return [
    'Hello, {name}!' => 'Hello, {name}!',
    'You have {n} new messages.' => 'You have {n} new messages.',
];

echo Yii::t('app', 'Hello, {name}!', ['name' => 'John']);
// 输出: Hello, John!

echo Yii::t('app', 'You have {n} new messages.', ['n' => 5]);
// 输出: You have 5 new messages.

echo Yii::t('app', 'Hello, {0}!', ['John']);
// 输出: Hello, John!

echo Yii::t('app', 'You have {0} new messages.', [5]);
// 输出: You have 5 new messages.

return [
    'Hello, {0}!' => 'Hello, {0}!',
    'You have {0} new messages.' => 'You have {0} new messages.',
];

echo Yii::t('app', 'Hello, {0}!', ['John']);
// 输出: Hello, John!

echo Yii::t('app', 'Hello, {0}! You have {1} new messages.', ['John', 5]);
// 输出: Hello, John! You have 5 new messages.