Solution: If you need to output something onto the screen you’ll need to use echo or print_r.

Solution: The statement should be print_r(‘Hello World’) to print Hello world. Also if there is only one line then there is no requirement of a semicolon, but it is better to use it.

Solution: In PHP, all user-defined functions, classes, and keywords (e.g. if, else, while, echo, etc.) are case-insensitive.

Solution: In PHP, all variables are case-sensitive.

Solution: # is a single line comment.

Solution: You can use tags like italics, bold etc. inside php script.

Solution: It would have printed echo “Hello world” if we have put backslash doublequotes just before and just after Hello World string.

Solution: You can not have php tags inside a php tag.

Solution: To print red remove the .