导读：本文将花点时间来解释Laravel中的Helper方法是如何创建的。
Laravel中的Helper方法是用来创建自定义的方法，也称为辅助方法。在之前我不太热衷于创建自定义函数，随着时间流转，我开始越来越频繁的使用它们。
什么是Laravel助手
Laravel框架中的Helper方法其实就是普通的PHP函数，开发者可以从Laravel应用程序的任何部分来调用它，比如我们已经在该框架中使用内置的route(),url(),view(),dd()等方法一样，不需要引用任何PHP文件或者声明任何namespace来使用，如同奇迹般，他们可以在你的应用程序中的任何部件中使用。
接下来，我开始讲述用于自定义创建辅助方法的用例。如果代码中多次使用了通用逻辑，可以把它们提取到辅助方法中。
我常在Blade视图中使用辅助方法来简化格式设置，例如在数字前添加货币符号，或者在特定的数字中格式化显示，以及在应用程序中设置人性化的日期等。
创建自定义辅助方法
在Laravel中，在app目录中创建一个文件，然后通过composer让应用程序启动时自动加载。创建自定义辅助方法并非易事，在我的经验中，将功能放在Helps.php中，然后将该文件放在app/Utils下，实用程序工具类，你可以根据自身情况在app中任何目录都可以。
接下来，需要将该文件登记到位于composer.json，这个在项目根目录的文件中。
{"name": "laravel/framework","description": "The Laravel Framework.","keywords": ["framework", "laravel"],"license": "MIT","homepage": "https://laravel.com","support": {"issues": "https://github.com/laravel/framework/issues","source": "https://github.com/laravel/framework"},"authors": [{"name": "Taylor Otwell","email": "[email protected]"}],"require": {"php": "^7.2.5","ext-json": "*","ext-mbstring": "*","ext-openssl": "*","doctrine/inflector": "^1.4|^2.0","dragonmantank/cron-expression": "^2.0","egulias/email-validator": "^2.1.10","league/commonmark": "^1.3","league/flysystem": "^1.0.8","monolog/monolog": "^2.0","nesbot/carbon": "^2.17","opis/closure": "^3.1","psr/container": "^1.0","psr/simple-cache": "^1.0","ramsey/uuid": "^3.7|^4.0","swiftmailer/swiftmailer": "^6.0","symfony/console": "^5.0","symfony/error-handler": "^5.0","symfony/finder": "^5.0","symfony/http-foundation": "^5.0","symfony/http-kernel": "^5.0","symfony/mime": "^5.0","symfony/polyfill-php73": "^1.17","symfony/process": "^5.0","symfony/routing": "^5.0","symfony/var-dumper": "^5.0","tijsverkoyen/css-to-inline-styles": "^2.2.2","vlucas/phpdotenv": "^4.0","voku/portable-ascii": "^1.4.8"},"replace": {"illuminate/auth": "self.version","illuminate/broadcasting": "self.version","illuminate/bus": "self.version","illuminate/cache": "self.version","illuminate/config": "self.version","illuminate/console": "self.version","illuminate/container": "self.version","illuminate/contracts": "self.version","illuminate/cookie": "self.version","illuminate/database": "self.version","illuminate/encryption": "self.version","illuminate/events": "self.version","illuminate/filesystem": "self.version","illuminate/hashing": "self.version","illuminate/http": "self.version","illuminate/log": "self.version","illuminate/mail": "self.version","illuminate/notifications": "self.version","illuminate/pagination": "self.version","illuminate/pipeline": "self.version","illuminate/queue": "self.version","illuminate/redis": "self.version","illuminate/routing": "self.version","illuminate/session": "self.version","illuminate/support": "self.version","illuminate/testing": "self.version","illuminate/translation": "self.version","illuminate/validation": "self.version","illuminate/view": "self.version"},"require-dev": {"aws/aws-sdk-php": "^3.0","doctrine/dbal": "^2.6","filp/whoops": "^2.4","guzzlehttp/guzzle": "^6.3.1|^7.0","league/flysystem-cached-adapter": "^1.0","mockery/mockery": "^1.3.1","moontoast/math": "^1.1","orchestra/testbench-core": "^5.0","pda/pheanstalk": "^4.0","phpunit/phpunit": "^8.4|^9.0","predis/predis": "^1.1.1","symfony/cache": "^5.0"},"conflict": {"tightenco/collect": "<5.5.33"},"autoload": {"files": ["src/Illuminate/Foundation/helpers.php","src/Illuminate/Support/helpers.php"],"psr-4": {"Illuminate\\": "src/Illuminate/"}},"autoload-dev": {"files": ["tests/Database/stubs/MigrationCreatorFakeMigration.php"],"psr-4": {"Illuminate\\Tests\\": "tests/"}},"extra": {"branch-alias": {"dev-master": "7.x-dev"}},"suggest": {"ext-gd": "Required to use Illuminate\\Http\\Testing\\FileFactory::image().","ext-memcached": "Required to use the memcache cache driver.","ext-pcntl": "Required to use all features of the queue worker.","ext-posix": "Required to use all features of the queue worker.","ext-redis": "Required to use the Redis cache and queue drivers (^4.0|^5.0).","aws/aws-sdk-php": "Required to use the SQS queue driver, DynamoDb failed job storage and SES mail driver (^3.0).","doctrine/dbal": "Required to rename columns and drop SQLite columns (^2.6).","filp/whoops": "Required for friendly error pages in development (^2.4).","fzaninotto/faker": "Required to use the eloquent factory builder (^1.9.1).","guzzlehttp/guzzle": "Required to use the HTTP Client, Mailgun mail driver and the ping methods on schedules (^6.3.1|^7.0).","laravel/tinker": "Required to use the tinker console command (^2.0).","league/flysystem-aws-s3-v3": "Required to use the Flysystem S3 driver (^1.0).","league/flysystem-cached-adapter": "Required to use the Flysystem cache (^1.0).","league/flysystem-sftp": "Required to use the Flysystem SFTP driver (^1.0).","mockery/mockery": "Required to use mocking (^1.3.1).","moontoast/math": "Required to use ordered UUIDs (^1.1).","nyholm/psr7": "Required to use PSR-7 bridging features (^1.2).","pda/pheanstalk": "Required to use the beanstalk queue driver (^4.0).","phpunit/phpunit": "Required to use assertions and run tests (^8.4|^9.0).","psr/http-message": "Required to allow Storage::put to accept a StreamInterface (^1.0).","pusher/pusher-php-server": "Required to use the Pusher broadcast driver (^4.0).","symfony/cache": "Required to PSR-6 cache bridge (^5.0).","symfony/filesystem": "Required to create relative storage directory symbolic links (^5.0).","symfony/psr-http-message-bridge": "Required to use PSR-7 bridging features (^2.0).","wildbit/swiftmailer-postmark": "Required to use Postmark mail driver (^3.0)."},"config": {"sort-packages": true},"minimum-stability": "dev","prefer-stable": true}
接下来，运行composer dump-autoload并重新启动应用程序，这样确保Helpers.php在Laravel启动时加载。
这样，你可以在Helpers.php中创建一个方法，然后在应用程序中访问调用此方法。
小结
Laravel 框架中的Helpers是一个非常方便且强大的功能，能够帮助开发者节约大量时间，这也是本文分享的初衷，希望更多人使用和创建自定义方法。
Happy Coding:)
参考资源：
https://laravel.com/docs/7.x/helpers
https://laravel.com/docs/7.x/facades#facades-vs-helper-functions
作者：晓明
来源：21CTO社区
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PHP技术栈 ：PHP 7.4，PHP Storm 201903，Laravel6.7更新
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