tanghengzhi.com

面试时间：2020年1月7号，星期一，上午十点。

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1.What does “&” mean in ‘&$var’?

Passing by Reference

https://www.php.net/manual/en/language.references.pass.php

2.What is MVC?

MVC is a design pattern used to decouple user-interface (view), data (model), and application logic (controller). This pattern helps to achieve separation of concerns.

https://dotnet.microsoft.com/apps/aspnet/mvc

3.What is the difference between $_GET and $_POST?

$_GET — HTTP GET variables
$_POST — HTTP POST variables

https://www.php.net/manual/en/reserved.variables.php

4.What will be the output of each statements below and why?

var_dump(0123 == 123);

var_dump(‘0123’ == 123);

var_dump(‘0123’ === 123);

False
True
False

https://www.php.net/manual/en/language.types.integer.php

5.After the code below is exexuted, what will be the value of $text and what will be strlen($text) return? Explain your answer.

$text = ‘John ‘;

$text[10] = ‘Doe’;

$text = 'John      D';
strlen($text) = 11;

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Javascript

1.What is the potential pitfall with using typeof bar == “object” to determine if bar is an object? How can this pitfall be avoided?

typeof null == "object"
bar != null && typeof bar == "object"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof

2.What is NaN? What is its type? How can you reliably test if a value is equal to NaN?

Not a number
Number
isNaN()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN

3.What is the difference between jQuery.get() and jQuery.ajax()?

$.get(url, data, success, dataType) is a shorthand Ajax function, which is equivalent to:

$.ajax({
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

https://api.jquery.com/jQuery.get/

4.Write a simple function(less than 80 characters) returns a boolean indicating whether or not a string is palindrome.

A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward. Allowances may be made for adjustments to capital letters, punctuation, and word dividers.

console.log(isPalindrome("level"));                    // logs 'true'
console.log(isPalindrome("levels"));                   // logs 'false'
console.log(isPalindrome("A car, a man, a maraca"));   // logs 'true'

function isPalindrome(str) {
    str = str.replace(/\W/g, "").toLowerCase();
    return str.split("").reverse().join("") == str;
}

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面试时间：2019年11月20号，星期三，下午两点。

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最近的项目中有使用 Laravel 吗？Laravel 的目录结构。

https://laravel.com/docs/6.x/structure

一道编程测试题。(代码点这里)

With the best of your knowledge, create 2 Apis as following: 

1 - Endpoint: /mail/contact

Description: This endpoint is used to send contact form to a specific email, It needs to use the SMTP server provided to dispatch the email to the target user, the email must include Name, Email, Message, and optionally an Attachment

Required Payload: 

{
   name: String,
   email: String,
   message: String,
   attachment: File
}

Tasks

- [ ] Send email using sendgrid to a configurable user email
- [ ] Handle errors
- [ ] Send attachments
- [ ] Send formatted html emails (can be vary basic using tags like div, b, pre etc)

2 - Endpoint: /mail/subscription

Description: This endpoint is used to store user subscription emails, the goal is to keep every email stored in a persistent storage, where it can be later retrieve for further usage. 

Required Payload: { email: string }

Tasks:

- [ ] Handles the case of duplicated entries
- [ ] Persist on local database

Additional Requirements: 

The apis has to work asynchronously (Non Blocking), follow RESTful conventions, clean code, follow Laravel standards, and lastly don’t use excuses like: “I didn’t do this because it’s was a simple project i didn’t felt it was necessary” we want see what you are capable of so do everything that’s under your knowledge. 

Deliverable:
- A ZIP of the project (without the vendor folder)

说说你对设计模式的理解和你运用设计模式的实例。

设计原则 > 设计模式

装饰器模式

适配器模式

你对PHP新版本的特性有关注吗？7.4 有哪些新特性你比较喜欢。

https://laravel-news.com/tag/php74

// 类型属性
https://wiki.php.net/rfc/typed_properties_v2

// 箭头函数
https://wiki.php.net/rfc/arrow_functions_v2

// 数组扩展运算符
https://wiki.php.net/rfc/spread_operator_for_array

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What‘s your favorite framework？Why？

Laravel

Document, Community, Packages, Eloquent ORM(ActiveRecord)

https://www.appclonescript.com/laravel-pros-cons/

What‘s the difference between left join and right join？

Can you explain what‘s Eager Loading？

https://laravel.com/docs/6.x/eloquent-relationships#eager-loading

//If we have 25 books, this loop would run 26 queries

$books = App\Book::all();

foreach ($books as $book) {
    echo $book->author->name;
}

//For this operation, only two queries will be executed
$books = App\Book::with('author')->get();

foreach ($books as $book) {
    echo $book->author->name;
}

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