How many main types of filtering are present in PHP?

What will be the output of the following PHP code?

Which function is used to read a file into an array?

Which PHP function can accept any number of parameters?

 Where session_start() function must appear in PHP? 

The right way to define a constant is?

What will be the output of the following PHP code?

for ($x = 0; $x <= 10; print ++$x)
{ print ++$x; }

  Which of the following is the right way to use the DateTime class?

 Which one of the following statements can be used to select the database? 

 What will be the output of the following PHP code?

<?php

    $title = "O'malley wins the heavyweight championship!";

    echo ucwords($title);

    ?>