200-710 sample questions

Question 1

After performing the following operations: What will be the value of $a?

Accepted Answer

array(‘a’, ’b’, ’o’)

Answer

arrayfc’, ’b’, 'a')

Answer

array(2, 1, 0)

Answer

None of the above

Question 2

True or false: you can catch fatal errors (e.g., parse errors, out of memory errors, compilation errors) in PHP 7 using try/catch.

Accepted Answer

False

Answer

True

Question 3

Which of the following are valid code snippets? (Choose three.)

Accepted Answer

function _4You(){}

Accepted Answer

function object(){}

Accepted Answer

$_1 = "Hello World”;

Answer

function 4You(){}

Answer

$1 = “Hello”;

Question 4

**Case Study: E-Commerce Platform Upgrade** An e-commerce company is upgrading its platform from a legacy PHP 5.4 system to PHP 7.1. The system has a central `Product` class and several specialized product types like `Book`, `Apparel`, and `Electronic`, which all inherit from `Product`. A key task is to refactor the product comparison logic. **Current Situation:** The `Product` class has a `compare()` method that uses complex `if/else` logic to compare two products. This method has become difficult to maintain. The system also frequently crashes due to type errors, as data from the database is not always in the expected format. **Requirements:** 1. **Refactor Comparison Logic:** Replace the `compare()` method with a more modern, concise solution for use in sorting functions like `usort()`. 2. **Improve Type Safety:** All methods that interact with the database must use strict type declarations for parameters and return values. For example, a method fetching a product by ID might not find it and should indicate this in a type-safe way. 3. **Add a New Feature:** A new `Shippable` interface must be created with methods `getWeight()` and `getDimensions()`. The `Apparel` and `Electronic` classes must implement this interface, but the `Book` class (which could represent an ebook) should not. Which code snippet most effectively implements all of these requirements using PHP 7.1 features? ```mermaid classDiagram class Product{ +int id +string name +float price +compareTo(Product other) } class Book extends Product class Apparel extends Product class Electronic extends Product interface Shippable{ > +getWeight() : float +getDimensions() : array } Apparel ..|> Shippable Electronic ..|> Shippable ```

Accepted Answer

Implement `compareTo(Product $other): int { return $this->price $other->price; }`. For the repository, use `function find(int $id): ?Product { ... }`. Add `implements Shippable` to `Apparel` and `Electronic`.

Answer

Implement `compareTo(Product $other): int { return $this->price $other->price; }`. For the repository, use `function find(int $id): Product { ... }` and return `null` on failure. Add `implements Shippable` to `Apparel` and `Electronic`.

Answer

Implement `compareTo($other) { return $this->price - $other->price; }`. For the repository, use `/** @return Product|null */ function find($id) { ... }`. Use a `Shippable` trait and add it to all product subclasses.

Answer

Keep the existing `compare()` method. For the repository, use `function find(int $id)` and throw an exception on failure. Create an abstract `Shippable` class that `Apparel` and `Electronic` extend.

Question 5

What is the output of the following code?

Accepted Answer

“second"

Answer

“first”

Answer

an empty string

Answer

an error

Question 6

An unbuffered database query will (choose two):

Accepted Answer

A return the first data faster

Accepted Answer

use less memory

Answer

return all data faster

Answer

free connection faster for others scripts to use

Question 7

One common security risk is exposing error messages directly in the browser. Which PHP configuration directive can be disabled to prevent this?

Accepted Answer

display_errors

Answer

html_display

Answer

error_reporting

Answer

errorjog

Answer

ignore_repeated_errors

Question 8

What is the output of the following code?

Accepted Answer

1:MyExeption

Answer

A parser error, try cannot be followed by multiple catch

Answer

1: Exception

Answer

2:MyException

Answer

MyException

Question 9

What is the difference between the spaceship operator ( ) and the strcmpO function?

Accepted Answer

The spaceship operator returns -1, 0 or 1; strcmpO may return any integer

Answer

There is no difference in functionality

Answer

strcmpO returns a Boolean value, the spaceship operator a number

Answer

strcmpO does a case-intensive comparison, the spaceship operator does not

200-710 Zend Certified Engineer Practice Questions

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