How many error levels are available in PHP?

 Which version of PHP was added with Exception handling? 

The touch() function sets the file filename's last modified and last-accessed times.

Which function displays the web page's most recent modification date?

 Which one of the following functions can be used to compress a string? 

Which one of the following functions is used to determine whether a class exists?

Which of the following functions is useful when you want to output the executed command result?

What is the purpose of the trim() function in PHP?

What PHP control structure can you use to replace multiple if-else statements for checking the value of a variable?

There are two objects-
$product1 = new Shop();
$product2 = new Shop();
Which one of the following statements is right about them?