Which function can you use in error handling to stop the execution of a script and is equivalent to exit()?

The command _______ :users somefile.txt changes the group affiliation of somefile.txt to users.

The metacharacter, ____, specifies an anchor at the end of the line.

What function allows you to print a backtrace?

What are Traits in PHP?

What will be the value of $result? 1, 'val2' => array('val21' => 21, 'val22' => 22), 'val3' => 3 ); $result = array_key_exists('val22', $myArr); ?>