Web scrappers are simple programs that are used to extract certain data from the web. Usually the structure of the the pages is known so scrappers have reduced complexity compared to parsers and crawlers.
In this tutorial we are going to create a simple parser that extract the title and favicon from any html page.
Usually scrappers are based on regular expressions but we are going to avoid them because they are difficult to manage and sometimes they have unexpected results. We are going to use simple php string functions instead.