What does the array_combine (a, b) function do?

Best practice for running MySQL queries in PHP? Consider the risk of SQL injection.

Which methods should be used for sending an email using the variables $to, $subject, and $body?

Which is used to maintain the value of a variable over different pages?

Which will check if a function exists?

Which is not a file-related function in PHP?

Which subversion of PHP5 adds short array syntax?

What is the result of : $a = 'abcd'; if(strpos('a', $a)) { return true; } else { return false; }

What's the output?

Time complexity of a call to array_search()?