By Matthew Turland
Regardless of all of the developments in net APIs and interoperability, it is inevitable that, at some point soon on your occupation, you'll have to "scrape" content material from an internet site that used to be now not equipped with net providers in brain. And, regardless of its occasionally less-than-stellar recognition, internet scraping is generally a complete valid activity-for instance, to seize information from an outdated model of an internet site for insertion right into a glossy CMS. This publication, written via scraping specialist Matthew Turland, covers net scraping innovations and issues that diversity from the easy to unique utilizing a number of applied sciences and frameworks: · realizing HTTP requests · The Hypertext Preprocessor HTTP streams wrapper · cURL · pecl_http · PEAR:HTTP · Zend_Http_Client · development your personal scraping library · utilizing Tidy · interpreting code with the DOM, SimpleXML and XMLReader extensions · CSS selector libraries · PCRE development matching · assistance and tips · Multiprocessing / parallel processing
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Extra info for php|architect's Guide to Web Scraping
Note that the value of this counter will need to be expressed to the server as a hexadecimal number. The dechex PHP function is useful for this. • Generate a random hash using the aforementioned hashing functions that we’ll call the client nonce or cnonce. The time and rand functions may be useful here. This can (and probably should) be regenerated and resent with each request. php $cnonce = md5($_SERVER[’REMOTE_ADDR’] . > • Take note of the value of the nonce key provided by the server, also known as the server nonce.
The next few chapters will expound upon this information by reviewing several commonly used PHP HTTP client implementations. Download from Wow! com> Download from Wow! com> Chapter 3 At this point, you should be fairly well-acquainted with some of the general concepts involved in using an HTTP client. The next few chapters will review some of the more popular mainstream client libraries, particularly common use cases and the advantages and disadvantages of each. This client covered in this chapter will be the HTTP streams wrapper.
Org There are a few notable traits of this URL. • A question mark denotes the end of the resource path and the beginning of the query string. • The query string is composed of key-value pairs where each pair is separated by an ampersand. • Keys and values are separated by an equal sign. Query strings are not specific to GET operations and can be used in other operations as well. Speaking of which, let’s move on. Download from Wow! com> • query=&var=value is the query string, which will be covered in more depth in the next section.
php|architect's Guide to Web Scraping by Matthew Turland