Tuesday, June 18, 2019
- Web Scraping Tools
- Php Curl Web Scraping Example Pdf
- Php Curl Web Scraping Example Github
- Php Scraping Library
- The Web Scraping API is very useful when you want to extract content from the HTML source of the web pages. There are various Web Scraping API available to scrape the webpage data, Scrapestack is one of the best free Web Scraping API among them. Scrapestack API enables you to scrape data from the website in realtime. Scrapestack provides easy.
- PHP CURL Tutorial Made Easy For Beginners GRAB MY COURSE Do you want to become. Source AdBlocker Detected Please support this website by disabling your AdBlocker.
- Apr 14, 2014 If you are brand new to PHP and want a more basic tutorial, check out our Introduction to PHP, then come back and complete this one. If you feel like you have the basics down, let’s jump right in. Today, we’re going to use cURL and PHP to scrape a website for data, specifically the list of most often downloaded ebooks at Project Gutenberg.
You may also interested in below Octoparse blogs on PhP and web crawling:
Before getting started, I'll give a quick summary of the web scraping. Web scraping is to extract information from within the HTML of a web page. Web scraping with PHP doesn't make any difference than any other kind of computer languages or web scraping tools, like Octoparse.
This article is to illustrate how a beginner could build a simple web crawler in PHP. If you plan to learn PHP and use it for web scraping, follow the steps below.
Screen Scraping: How to Screen Scrape a Website with PHP and cURL. Screen scraping has been around on the internet since people could code on it, and there are dozens of resources out there to figure out how to do it (google php screen scrape to see what I mean). I want to touch on some things that I've figured out while scraping some screens. Next, we use pregmatchall with a regular expression to turn the data on the page into a PHP array. This example will demonstrate scraping this web site's blog page to extract the most recent blog posts. This is just for demo purposes - of course, the RSS feed is much better suited for this.
Web Crawler in PhP
Step 1.
Add an input box and a submit button to the web page. We can enter the web page address into the input box. Regular Expressions are needed when extracting data.
Step 2.
Regular expressions are needed when extracting data.
function preg_substr($start, $end, $str) // Regular expression
{
$temp = preg_split($start, $str);
$content = preg_split($end, $temp[1]);
return $content[0];
}
Step 3.
String Split is needed when extracting data.
function str_substr($start, $end, $str) // string split
{
$temp = explode($start, $str, 2);
$content = explode($end, $temp[1], 2);
return $content[0];
}
Step 4.
Add a function to save the content of extraction:
function writelog($str)
{
@unlink('log.txt');
$open=fopen('log.txt','a' );
fwrite($open,$str);
fclose($open);
}
When the content we extracted is inconsistent with what is displayed in the browser, we couldn’t find the correct regular expressions. Here we can open the saved .txt file to find the correct string.
function writelog($str)
{
@unlink('log.txt');
$open=fopen('log.txt','a' );
fwrite($open,$str);
fclose($open);
}
Step 5.
A function would be needed as well if you need to capture pictures.
function getImage($url, $filename=', $dirName, $fileType, $type=0)
{
if($url '){return false;}
//get the default file name
$defaultFileName = basename($url);
//file type
$suffix = substr(strrchr($url,'.'), 1);
if(!in_array($suffix, $fileType)){
return false;
}
//set the file name
$filename = $filename ' ? time().rand(0,9).'.'.$suffix : $defaultFileName;
//get remote file resource
if($type){
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file = curl_exec($ch);
curl_close($ch);
}else{
ob_start();
readfile($url);
$file = ob_get_contents();
ob_end_clean();
}
//set file path
$dirName = $dirName.'/'.date('Y', time()).'/'.date('m', time()).'/'.date('d',time()).'/';
Web Scraping Tools
if(!file_exists($dirName)){
mkdir($dirName, 0777, true);
}
//save file
$res = fopen($dirName.$filename,'a');
fwrite($res,$file);
fclose($res);
return $dirName.$filename;
}
Step 6.
We will write the code for extraction. Let’s take a web page from Amazon as an example. Enter a product link.
if($_POST[‘URL’]){
//---------------------example-------------------
$str = file_get_contents($_POST[‘URL’]);
$str = mb_convert_encoding($str, ‘utf-8’,’iso-8859-1’);
writelog($str);
//echo $str;
echo(‘Title:’ . Preg_substr(‘/<span id= “btAsinTitle”[^>}*>/’,’/<Vspan>/$str));
echo(‘<br/>’);
$imgurl=str_substr(‘var imageSrc = “’,’”’,$str);
Php Curl Web Scraping Example Pdf
echo ‘<img src=”’.getImage($imgurl,”,’img’ array(‘jpg’));
Then we can see what we extract. Below is the screenshot.
Web Crawling for Non-coders
You don't need to code a web crawler any more if you have an automatic web crawler.
Php Curl Web Scraping Example Github
As mentioned previously, PHP is only a tool that is used in creating a web crawler. Computer languages, like Python and JavaScript, are also good tools for those who are familiar with them. Nowadays, with the development of web-scraping tech, more and more web scraping tools, such as Octoparse, Beautiful Soup, Import.io, and Parsehub, are emerging in multitude. They simplify the process of creating a web crawler.
Take Octoparse Web Scraping Templates as an example, it enables everyone to scrape data using pre-built templates, no more crawler setup, simply enter the keywords to search with and get data instantly.
Php Scraping Library
Artículo en español: Crear un Simple Web Crawler en PHP
También puede leer artículos de web scraping en el Website Oficial