php - Where to find defined language functions in Laravel?

Solution:

vendor/laravel/framework/src/Illuminate/Foundation/helpers.php

Answer

Solution:

Those methods are defined in the .

As you can see in the source code, the helper is defined as follows:

if (! function_exists('trans')) {
    /**
     * Translate the given message.
     *
     * @param  string|null  $key
     * @param  array  $replace
     * @param  string|null  $locale
     * @return \Illuminate\Contracts\Translation\Translator|string|array|null
     */
    function trans($key = null, $replace = [], $locale = null)
    {
        if (is_null($key)) {
            return app('translator');
        }

        return app('translator')->get($key, $replace, $locale);
    }
}

Also, as you said, the helper is an alias for the trans() helper:

if (! function_exists('__')) {
    /**
     * Translate the given message.
     *
     * @param  string|null  $key
     * @param  array  $replace
     * @param  string|null  $locale
     * @return string|array|null
     */
    function __($key = null, $replace = [], $locale = null)
    {
        if (is_null($key)) {
            return $key;
        }

        return trans($key, $replace, $locale);
    }
}

Source