Twig 3 Certification Test 3

Instructions

This test consists of 45 new questions about Twig 3. It covers various topics and has a time limit of 60 minutes. Choose the best answer for each question.

Questions

Basic Concepts

1. What is the main advantage of using Twig over plain PHP for templating?

   • A) Twig is faster than PHP
   • B) Twig provides a cleaner syntax and better separation of logic and presentation
   • C) Twig supports more programming languages
   • D) Twig is built into PHP

2. Which of the following is a valid way to comment in Twig?

   • A) // This is a comment
   • B) /* This is a comment */
   • C) {# This is a comment #}
   • D) <!-- This is a comment -->

3. What is the purpose of the |striptags filter?

   • A) To remove all HTML tags from a string
   • B) To escape HTML tags
   • C) To format a string as HTML
   • D) To convert a string to uppercase

Filters

1. Which filter would you use to format a number as currency?

   • A) format_currency
   • B) currency_format
   • C) number_format
   • D) money_format

2. What does the |replace filter do?

   • A) Replaces all occurrences of a substring with another string
   • B) Replaces the first occurrence of a substring
   • C) Replaces a string with a number
   • D) None of the above

3. How do you apply multiple filters to a variable?

   • A) {{ variable|filter1|filter2|filter3 }}
   • B) {{ filter1(filter2(filter3(variable))) }}
   • C) {{ variable|filter1(filter2(filter3)) }}
   • D) Both A and B

Tests

1. What test can be used to check if a variable is a string?

   • A) is_string
   • B) string
   • C) is iterable
   • D) is defined

2. How do you combine multiple tests in a single condition?

   • A) Using && and ||
   • B) Using and and or
   • C) Using & and |
   • D) Both A and B

Control Structures

1. What is the correct syntax for a for loop that iterates over an array in Twig?

   • A) {% for item in array %}
   • B) {% loop item in array %}
   • C) {% each item in array %}
   • D) None of the above

2. How do you create an if statement with multiple conditions in Twig?

   • A) {% if condition1 and condition2 %}
   • B) {% if condition1 or condition2 %}
   • C) {% if condition1 and condition2 or condition3 %}
   • D) All of the above

Variables and Expressions

1. What is the output of {{ variable is not defined ? 'No' : 'Yes' }} if variable is defined?

   • A) No
   • B) Yes
   • C) Error
   • D) null

2. How do you access an array element in Twig?

   • A) {{ array[index] }}
   • B) {{ array->index }}
   • C) {{ array.index }}
   • D) Both A and C

Functions

1. Which function is used to get the size of an array in Twig?

   • A) count()
   • B) size()
   • C) length()
   • D) All of the above

2. What is the purpose of the dump function in Twig?

   • A) To output a variable's value for debugging
   • B) To clear the output buffer
   • C) To format a string
   • D) To include a template

Operators

1. What does the not operator do in Twig?

   • A) Negates a boolean value
   • B) Checks if a variable is not defined
   • C) Both A and B
   • D) None of the above

2. Which of the following is a valid comparison operator in Twig?

   • A) !=
   • B) !==
   • C) >
   • D) All of the above

Template Re-use

1. What is the purpose of the extends tag in Twig?

   • A) To include a template
   • B) To define a base template
   • C) To create a macro
   • D) To define a block

2. How do you embed a template in another template in Twig?

   • A) {% include 'template.twig' %}
   • B) {% embed 'template.twig' %}
   • C) {% import 'template.twig' %}
   • D) {% extend 'template.twig' %}

Mixed Questions

1. What is the output of {{ 'Hello World'|striptags }} if the input is <b>Hello</b> World?

   • A) Hello World
   • B) <b>Hello</b> World
   • C) Hello
   • D) Error

2. How do you create a conditional statement that checks if a variable is an array?

   • A) {% if variable is iterable %}
   • B) {% if variable is array %}
   • C) {% if variable is defined and variable is not null %}
   • D) All of the above

3. Which of the following is a valid way to define a block in Twig?

   • A) {% block name %}
   • B) {% define block name %}
   • C) {% function name() %}
   • D) {% template name() %}

4. What does the |date filter do?

   • A) Formats a date string
   • B) Converts a string to a date
   • C) Returns the current date
   • D) None of the above

5. How do you create a loop that iterates over a range of numbers in Twig?

   • A) {% for i in 1..10 %}
   • B) {% for i from 1 to 10 %}
   • C) Both A and B
   • D) None of the above

6. What is the purpose of the |join filter in Twig?

   • A) To join two strings
   • B) To join an array into a string
   • C) To join two arrays
   • D) To join two hashes

7. What does the |slice filter do?

   • A) Extracts a substring
   • B) Returns a portion of an array
   • C) Both A and B
   • D) None of the above

Advanced Questions

1. How do you check if an array contains a specific value in Twig?

   • A) value in array
   • B) array.contains(value)
   • C) array.includes(value)
   • D) array.has(value)

2. What is the output of {{ [1, 2, 3]|length }}?

   • A) 3
   • B) 2
   • C) 1
   • D) Error

3. Which of the following is a valid way to create a nested block in Twig?

   • A) {% block outer %}{% block inner %}{% endblock %}{% endblock %}
   • B) {% block outer %}{% endblock inner %}
   • C) {% block outer %}{% block inner %}{% endblock inner %}{% endblock outer %}
   • D) {% block outer %}{% block inner %}{% endblock outer %}{% endblock inner %}

4. How do you create a custom filter in Twig?

   • A) {% filter name %}
   • B) {% define filter name %}
   • C) {% filter name(value) %}
   • D) {% filter(name) %}

5. What is the purpose of the |default filter?

   • A) To provide a default value if a variable is undefined
   • B) To format a date
   • C) To convert a string to lowercase
   • D) To escape HTML

6. What is the output of {{ 'Twig'|length }}?

   • A) 4
   • B) 3
   • C) 5
   • D) Error

7. How do you create a loop that iterates over a hash in Twig?

   • A) {% for key, value in hash %}
   • B) {% for value in hash %}
   • C) {% for key => value in hash %}
   • D) {% for item in hash %}

8. What does the |merge filter do?

   • A) Merges two arrays
   • B) Merges two hashes
   • C) Merges two strings
   • D) Both A and B

9. What is the purpose of the |reverse filter?

   • A) To reverse a string
   • B) To reverse an array
   • C) To reverse a hash
   • D) All of the above

10. How do you create a loop that iterates over a hash and preserves the keys?

    • A) {% for key, value in hash %}
    • B) {% for value in hash %}
    • C) {% for key => value in hash %}
    • D) {% for item, value in hash %}

11. What is the output of {{ 'Hello World'|slice(6, 5) }}?

    • A) Hello
    • B) World
    • C) Hello World
    • D) Error

12. How do you create a conditional statement that checks if a variable is an object?

    • A) {% if variable is iterable %}
    • B) {% if variable is object %}
    • C) {% if variable is defined and variable is not null %}
    • D) All of the above

13. What is the purpose of the |sort filter?

    • A) To sort an array in ascending order
    • B) To sort a hash by keys
    • C) To sort a hash by values
    • D) All of the above

14. How do you create a loop that iterates over an array and skips every second element?

    • A) {% for item in array|slice(2) %}
    • B) {% for item in array|batch(2) %}
    • C) {% for item in array|slice(0, 2) %}
    • D) {% for item in array|slice(1, 2) %}

15. What does the |join filter do?

    • A) Joins two strings
    • B) Joins an array into a string
    • C) Joins two arrays
    • D) Joins two hashes

16. What is the output of {{ 10 % 3 }}?

    • A) 3
    • B) 1
    • C) 0
    • D) Error

17. What is the purpose of the |first filter?

    • A) To get the first element of an array
    • B) To get the first character of a string
    • C) To get the first key of a hash
    • D) All of the above

18. How do you create a loop that iterates over a hash and preserves the keys as variables?

    • A) {% for key, value in hash %}
    • B) {% for value in hash %}
    • C) {% for key => value in hash %}
    • D) {% for key, value in hash with keys %}

19. What is the purpose of the |batch filter?

    • A) To batch an array into smaller arrays
    • B) To batch a hash into smaller hashes
    • C) To batch a string into smaller strings
    • D) To batch a number into smaller numbers

20. What is the output of {{ 'Twig'|upper }}?

    • A) Twig
    • B) TWIG
    • C) twig
    • D) Error

Answers

Basic Concepts

1. B) Twig provides a cleaner syntax and better separation of logic and presentation
2. C) {# This is a comment #}
3. A) To remove all HTML tags from a string

Filters

1. C) number_format
2. A) Replaces all occurrences of a substring with another string
3. D) Both A and B

Tests

1. A) is_string
2. D) Both A and B

Control Structures

1. A) {% for item in array %}
2. D) All of the above

Variables and Expressions

1. B) Yes
2. D) Both A and C

Functions

1. D) All of the above
2. A) To output a variable's value for debugging

Operators

1. C) Both A and B
2. D) All of the above

Template Re-use

1. B) To define a base template
2. B) {% embed 'template.twig' %}

Mixed Questions

1. A) Hello World
2. D) All of the above
3. A) {% block name %}
4. A) Formats a date string
5. C) Both A and B
6. B) To join an array into a string
7. C) Both A and B

Advanced Questions

1. A) value in array
2. A) 3
3. A) {% block outer %}{% block inner %}{% endblock %}{% endblock %}
4. A) {% filter name %}
5. A) To provide a default value if a variable is undefined
6. C) 4
7. A) {% for key, value in hash %}
8. D) Both A and B
9. B) To reverse an array

10. A) {% for key, value in hash %}

11. B) World

12. D) All of the above
13. D) All of the above
14. B) {% for item in array|batch(2) %}
15. B) Joins an array into a string
16. B) 1
17. D) All of the above
18. A) {% for key, value in hash %}
19. A) To batch an array into smaller arrays
20. B) TWIG

Feel free to review your answers and see how well you understand Twig 3!