Which of the following is correct with regard to echo and print?

A file needs to be opened in a PHP application. Additionally, the application has to issue a warning and continue execution, in case the file is not found. The ideal function to use is:

Which functions output text?

Which function is used to destroy a variable or object?

How do you erase an element from an array, with numeric keys, to maintain a normalized integer series?

Fastest way to insert an item $item into the specified position $position of the array $array?

Function to simplify searches in databases where you know the pronunciation but not the spelling

PHP's echo and print functions are not exactly alike. Which will accept multiple parameters and concatenate them in its 'without parentheses' form?

Use of the final keyword in a method declaration prevent?

What's the output? array_map('print_r', array( 'a', 'b' ) );

use keyword is used only for namespace