Copyright

Hi I am beginner programmer from Poland and I would like to create my own PHP tutorial and post it in internet. And I would like to take only php commands from your site , some of the examples i.e code will be similar in a way that it will be written using an examples on your site. my question is : how can i make it without violation of law. and is it possible this code can be freely used by anybody for example for their own purpose even commertial . I am writing because i am quite honest person Best regards Paul