What tag is used to start a PHP block in a script file?
1. What tag is used to start a PHP block in a script file?
- A.<?php>
- B.<?php
- C.<script php>
- D.<php>
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PHP - Basics
PHP syntax, variables, array functions, file inclusion, and HTTP headers.
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Which operator is used for string concatenation in PHP?
2. Which operator is used for string concatenation in PHP?
- A.+
- B..
- C.&
- D.concat
What is the difference between `echo` and `print` in PHP?
3. What is the difference between `echo` and `print` in PHP?
- A.print can write to files; echo can only output to the browser.
- B.echo has no return value and is slightly faster; print returns 1.
- C.echo is a function; print is a class constructor.
- D.There is no difference in return value or performance.
What is an associative array in PHP?
4. What is an associative array in PHP?
- A.An array containing database connection pools
- B.An array that uses named string keys instead of integers
- C.A multidimensional array containing other arrays
- D.An array where values must be objects
What is the difference between single-quoted strings ('...') and double-quoted strings ("...") in PHP?
5. What is the difference between single-quoted strings ('...') and double-quoted strings ("...") in PHP?
- A.Single quotes parse variables; double quotes treat text literally.
- B.Double quotes parse variables and escape sequences; single quotes treat text literally.
- C.Single quotes are for characters; double quotes are for strings.
- D.There is no difference; they are identical.
What is the default index index number of the first element in a PHP indexed array?
6. What is the default index index number of the first element in a PHP indexed array?
- A.1
- B.0
- C.-1
- D.null
Which character must precede all variable names in PHP?
7. Which character must precede all variable names in PHP?
- A.var
- B.$
- C.@
- D.#
Which PHP function checks if a specific value exists inside an array?
8. Which PHP function checks if a specific value exists inside an array?
- A.array_key_exists() (checks for keys, not values)
- B.in_array()
- C.contains()
- D.has_value()
Which function is used to count the number of elements in a PHP array?
9. Which function is used to count the number of elements in a PHP array?
- A.len()
- B.count()
- C.length()
- D.size()
Which operator is used to assign key-value pairs inside a PHP associative array?
10. Which operator is used to assign key-value pairs inside a PHP associative array?
- A.-> (used for accessing object properties/methods)
- B.=>
- C.:
- D.=
Where are PHP session variables stored by default?
11. Where are PHP session variables stored by default?
- A.In the client's browser cookies
- B.On the web server
- C.In local storage databases
- D.Inside the HTML source code
Which superglobal array contains form variables sent via HTTP GET method?
12. Which superglobal array contains form variables sent via HTTP GET method?
- A.$_POST
- B.$_GET
- C.$_REQUEST
- D.$_SERVER
Which superglobal array combines data from `$_GET`, `$_POST`, and `$_COOKIE`?
13. Which superglobal array combines data from `$_GET`, `$_POST`, and `$_COOKIE`?
- A.$_SERVER
- B.$_REQUEST
- C.$_ENV
- D.$_GLOBALS
Which superglobal array contains form variables sent via HTTP POST method?
14. Which superglobal array contains form variables sent via HTTP POST method?
- A.$_GET
- B.$_POST
- C.$_REQUEST
- D.$_SESSION
How do you define a constant in PHP using the built-in function?
15. How do you define a constant in PHP using the built-in function?
- A.const PI = 3.14; (while valid inside classes and since PHP 5.3, define() is the classic built-in function option)
- B.define('PI', 3.14);
- C.constant PI = 3.14;
- D.$PI = 3.14;
Which loop structure is designed specifically for iterating over PHP arrays?
16. Which loop structure is designed specifically for iterating over PHP arrays?
- A.for ($i=0; $i < count($array); $i++) (while valid, foreach is designed specifically for this task)
- B.foreach ($array as $value)
- C.while ($array)
- D.foreach ($value in $array)
What is the purpose of the `session_start()` function?
17. What is the purpose of the `session_start()` function?
- A.Encrypts user passwords inside databases
- B.Starts or resumes a user session, enabling the use of $_SESSION.
- C.Authenticates user credentials against records
- D.Clears all cookies from the client browser
How do you access a global variable `$x` inside a PHP function?
18. How do you access a global variable `$x` inside a PHP function?
- A.Variables are global by default in PHP.
- B.Declare `global $x;` at the beginning of the function.
- C.Access it using `$this->x`.
- D.Import it using `import $x;`.
Where are PHP cookie variables stored?
19. Where are PHP cookie variables stored?
- A.On the web server files
- B.In the client's browser
- C.In server-side databases
- D.In session state caches
How do you write a string to a file in PHP using a single function?
20. How do you write a string to a file in PHP using a single function?
- A.fwrite() (requires opening the file first)
- B.file_put_contents()
- C.file_write()
- D.write_file()
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