Which function can be used to simplify searches in databases where you know the pronunciation but not the spelling

Choose the correct output of:

Which is NOT true for PHP constants?

Which mode parameter should be used with the fopen() function to open a file and point to the end for writing only?

Default timeout of a PHP session cookie ?

What's the output? $one='two'; $two='one'; echo $$$one;

Which functions output text?

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 is correct with regard to echo and print?

Output of the code?

What is the output?