PHP Basic Questions

Use these questions to check the PHP basics covered in the introductory tutorials. Select one answer for each question, then choose Check answers to see your score and an explanation for every item.

1. Which construct is commonly used to output text in PHP?

print_r() only

echo

input

2. Which is a valid PHP variable?

$name

name$

var name

3. Which operator joins two strings in PHP?

+

&

.

4. Which superglobal normally contains values submitted by a form using method="post"?

$_GET

$_POST

$_SERVER

5. Which loop is especially convenient for reading every element of an array?

foreach

switch

match

6. Which operator checks that two values have both the same value and the same type?

=

==

===

7. Which function can check whether a variable is set and is not null?

isset()

count()

sort()

8. Which function returns the number of elements in an array?

strlen()

count()

sizeof_text()

9. Which function is commonly used to safely display untrusted text inside HTML?

explode()

trim()

htmlspecialchars()

10. What is the practical difference between require and include when the requested file is missing?

There is no difference.

require stops normal execution; include allows the script to continue after the warning.

include can only load HTML files.

11. What does the ?? operator help with?

Choosing a fallback value when a value is missing or null.

Concatenating strings.

Starting a PHP comment.

12. Which approach should be used when user input becomes a value in an SQL query?

Concatenate the raw input directly into the SQL string.

Hide the input field with CSS.

Use a prepared statement with bound parameters.

Review the PHP basics

If a question was difficult, review PHP introduction and basics, PHP variables, PHP loops, PHP arrays, and forms and validation before trying the quiz again.

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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