What does the array_unshift () function do?

What kind of regular expression does PHP include?

Which is a type of array in PHP?

With the following code, will the word Hello be displayed on screen? Hello

What's the output?

What's the output?

Difference between $message and $$message?

How do you make PHP use a class file without having to require or include it manually?

Which values should be assigned to the variables $a, $b and $c in order for the following script to display the string Hello, World!

Which functions split the string and return the array?

How can we delete a file using php function.