php - 拉维尔 5 : Why can't I use integers and floating point numbers in the language files?

Question

假设我在我正在处理的 Laravel 5 项目中有这个语言文件 resources/lang/en/settings.php。这个文件看起来像这样:

<?php
    return [
        "key_1" => 50,
        "key_2" => "50",
    ];

现在，如果我想像这样获取 key_1 的值:

return trans("settings.key_1"); // returns "settings.key_1"

这将返回 settings.key_1，它不是 50，这是我期望的值。另一方面，如果我尝试获取同样为 50 的 key_2 的值，但这次作为字符串，它将按预期返回 50。

return trans("settings.key_2"); // returns 50

那么，为什么我不能在语言文件中使用数字，为什么值必须是字符串？

Answer 1

来自sourcecode: 让我们从您正在调用的 trans 函数开始。

/**
 * Get the translation for a given key.
 */
public function trans($id, array $parameters = [], $domain = 'messages', $locale = null)
{
    return $this->get($id, $parameters, $locale);
}

$this->get()调用的get函数

/**
 * Get the translation for the given key.
 */
public function get($key, array $replace = [], $locale = null, $fallback = true)
{
    list($namespace, $group, $item) = $this->parseKey($key);
    // Here we will get the locale that should be used for the language line. If one
    // was not passed, we will use the default locales which was given to us when
    // the translator was instantiated. Then, we can load the lines and return.
    $locales = $fallback ? $this->parseLocale($locale) : [$locale ?: $this->locale];
    foreach ($locales as $locale) {
        $this->load($namespace, $group, $locale);
        $line = $this->getLine(
            $namespace, $group, $locale, $item, $replace
        );
        if (! is_null($line)) {
            break;
        }
    }
    // If the line doesn't exist, we will return back the key which was requested as
    // that will be quick to spot in the UI if language keys are wrong or missing
    // from the application's language files. Otherwise we can return the line.
    if (! isset($line)) {
        return $key;
    }
    return $line;
}

如你所见:

    // If the line doesn't exist, we will return back the key which was requested as
    // that will be quick to spot in the UI if language keys are wrong or missing
    // from the application's language files. Otherwise we can return the line.
    if (! isset($line)) {
        return $key;
    }

该值不是有效值，因此未传递 isset，因此它将返回 $key 值，这是您请求的键。

为了更进一步，我们可以查看以下在 get 函数中调用的函数。

/**
 * Retrieve a language line out the loaded array.
 */
protected function getLine($namespace, $group, $locale, $item, array $replace)
{
    $line = Arr::get($this->loaded[$namespace][$group][$locale], $item);
    if (is_string($line)) {
        return $this->makeReplacements($line, $replace);
    } elseif (is_array($line) && count($line) > 0) {
        return $line;
    }
}

这里我们看到以下内容:

    if (is_string($line)) {

这是框架实际检查值是否为字符串的地方。