PHP Technology & Digital Applications 5

Question 1

What PHP function checks whether a variable is an array?

Accepted Answer

is_array()

Answer

is_array() returns true if the given variable is an array, making it the simplest type-check for arrays.

Question 2

Which PHP global stores files uploaded via an HTML form?

Accepted Answer

$_FILES

Answer

$_FILES is the PHP superglobal that contains information about uploaded files, including name, type, size, and tmp_name.

Question 3

What is the purpose of PHP's `finally` block in exception handling?

Accepted Answer

It always executes after try/catch regardless of whether an exception was thrown

Answer

The finally block runs whether or not an exception was thrown, making it ideal for cleanup code like closing database connections.

Question 4

Which PHP function merges two or more arrays into one?

Accepted Answer

array_merge()

Answer

array_merge() combines one or more arrays, with later arrays overwriting string keys from earlier ones.

Question 5

In PHP, what does the null coalescing operator `??` do?

Accepted Answer

Returns the left operand if it is set and not null, otherwise returns the right operand

Answer

The ?? operator returns its left-hand operand if it exists and is not null, otherwise it returns its right-hand operand.

PHP - PHP Programming Language Practice Test