PHP Technology & Digital Applications 3

Question 1

Which PHP function sends a raw HTTP header to the client?

Accepted Answer

header()

Answer

The header() function sends a raw HTTP header and must be called before any output is sent.

Question 2

What PHP interface must be implemented to make an object iterable with foreach?

Accepted Answer

Iterator

Answer

Implementing the Iterator interface with its five required methods (current, key, next, rewind, valid) allows foreach iteration.

Question 3

Which PHP function converts a Unix timestamp to a formatted date string?

Accepted Answer

date()

Answer

The date() function formats a Unix timestamp as a human-readable date string using format characters.

Question 4

In PHP, what is the purpose of the `ob_start()` function?

Accepted Answer

Begins output buffering

Answer

ob_start() activates output buffering so that script output is captured in a buffer instead of sent directly to the browser.

Question 5

Which PHP function generates a cryptographically secure random integer?

Accepted Answer

random_int()

Answer

random_int() uses a cryptographically secure pseudo-random number generator, unlike rand() or mt_rand().

PHP - PHP Programming Language Practice Test