PHP Basics

Core PHP understanding for real-world web dev.

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Beginner � ~6 min

Q1. What does PHP stand for (originally)?

Select one answer � 1 pt

Personal Home Page Private Home Page Preprocessed Hypertext Page Programming Hypertext Processor

Q2. Which symbol is used to start a variable in PHP?

Select one answer � 1 pt

$ % @ #

Q3. Which function outputs text to the browser in PHP?

Select one answer � 1 pt

write() printf() echo output()

Q4. Which superglobal contains data sent by an HTML form using method="POST"?

Select one answer � 1 pt

$_SERVER $_GET $_REQUEST_URI $_POST

Q5. What will strlen("SmartAssess") return?

Select one answer � 1 pt

8 11 10 9

Q6. Which operator is used for concatenation in PHP?

Select one answer � 1 pt

+ . :: &

Q7. Which statement properly checks if a key exists in an array?

Select one answer � 1 pt

array_has("a", $arr) key_in_array("a", $arr) in_array("a", $arr) array_key_exists("a", $arr)

Q8. What does isset($x) return when $x is null?

Select one answer � 1 pt

null true false throws an error

Q9. Which function would you use to safely escape output for HTML to prevent XSS?

Select one answer � 1 pt

strip_tags() htmlspecialchars() htmlentities_decode() urldecode()

Q10. In PHP, what does PDO primarily provide?

Select one answer � 1 pt

A database access layer (with prepared statements) A templating engine for HTML A CLI-only routing system A CSS framework

Q11. Which is the correct way to start a PHP session?

Select one answer � 1 pt

session_begin(); session_start(); init_session(); start_session();

Q12. Which superglobal is commonly used for data submitted via POST?

Select one answer � 1 pt

$_POST $_GET $_SERVER $_FILES

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