Question

有时我写

use Said\Class;

在我的php文件的顶部，如果我使用该类作为构造函数的参数，或者即使我正在实例化。

但是什么时候写整个班级名称更合适？像：

$service = new \Said\Class();而不是宣布它？

如果我使用常量，我通常会把它写出来。但也许你应该总是将它声明在文件的顶部。不确定效率或标准方面。

Answer 1

与您的示例不同，大多数命名空间都很长，因此使用use会大大减少代码的行长度，从而使其更具可读性。

这是一个例子，你更喜欢哪个？

<?php
namespace App\Exceptions;

class Handler extends \Illuminate\Foundation\Exceptions\Handler {
    /**
     * A list of the exception types that should not be reported.
     *
     * @var array
     */
     protected $dontReport = [
        \Illuminate\Auth\Access\AuthorizationException::class,
        \Symfony\Component\HttpKernel\Exception\HttpException::class,
        \Illuminate\Database\Eloquent\ModelNotFoundException::class,
        \Illuminate\Foundation\Validation\ValidationException::class,
     ];
    /**
     * Report or log an exception.
     *
     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
     *
     * @param  \Exception  $e
     * @return void
     */
    public function report(\Exception $e)
    {
        return parent::report($e);
    }
    /**
     * Render an exception into an HTTP response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Exception  $e
     * @return \Illuminate\Http\Response
     */
    public function render($request, \Exception $e)
    {
        if($e instanceof \Illuminate\Database\Eloquent\ModelNotFoundException)
        {
            abort(404);
        }
        return parent::render($request, $e);
    }
}

使用使用，更清洁。

<?php 
namespace App\Exceptions;

use Exception;
use Illuminate\Auth\Access\AuthorizationException;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Illuminate\Foundation\Validation\ValidationException;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;

class Handler extends ExceptionHandler {
    /**
     * A list of the exception types that should not be reported.
     *
     * @var array
     */
     protected $dontReport = [
        AuthorizationException::class,
        HttpException::class,
        ModelNotFoundException::class,
        ValidationException::class,
     ];
    /**
     * Report or log an exception.
     *
     * This is a great spot to send exceptions to Sentry, Bugsnag, etc.
     *
     * @param  \Exception  $e
     * @return void
     */
    public function report(Exception $e)
    {
        return parent::report($e);
    }
    /**
     * Render an exception into an HTTP response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Exception  $e
     * @return \Illuminate\Http\Response
     */
    public function render($request, Exception $e)
    {
        if($e instanceof ModelNotFoundException)
        {
            abort(404);
        }
        return parent::render($request, $e);
    }
}

何时编写“使用”声明与编写类的完整命名空间是否合适？

1 个答案: