What is the output of the following code?

<?php

  function abc()

  {

    return __FUNCTION__;

  }

  function xyz()

  {

    return abc();

  }

  echo xyz();

?>

In PHP5, what is the difference between using self and $this, and when is each appropriate?

The built-in function to get the number of parameters passed is

What is the output?

Use of the @ symbol in front of a variable?

Best method for sanitizing user input with PHP?

Which superglobals doesn't contain data from the client?

What data types cannot be used with PHP5 Type Hinting?

What is the time complexity of a call to array_key_exists()?

What will be the output: preg_match( '@^(?:http://)?([^/]+)@i', 'http://www.php.net/index.html', $matches ); $match = $matches[1]; echo $match;

Which type of error can NOT be caught with a custom error handler?