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• Php Curl Web Scraping Examples
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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.

Scrapestack API enables you to scrape data from the website in realtime. Scrapestack provides easy-to-use REST API that extracts data from a website without any programming and restriction with IP blocks, CAPTCHA, or geolocations. In this tutorial, we will show you how to integrate Web Scraping API with Scrapestack REST API using PHP. In this post, I’ll explain how to do a simple web page extraction in PHP using cURL, the ‘Client URL library’. The curl is a part of libcurl, a library that allows you to connect to servers with many different types of protocols.It supports the http, https and other protocols. This way of getting data from web is more stable with header/cookie/errors process rather than using simple file. Linux includes a ton of great utilities that make Bash scripts better. This post looks at how to use Curl, Grep, and Tail to fetch the latest release number of Firefox Developer Edition to automate its installation. Jan 02, 2015 If your are using PHP = 5.5, file upload like this (with ‘@’) probably won’t work, since they added SAFEUPLOAD CURL option and CURLFile class which you should use instead of ‘@’filename. Check this for more info on this topic. My example is built for PHP. In this article, I will discuss how to download and save image files with PHP/cURL web scraper. I will use email extractor script created earlier as example. With some modification, the same script can then be used to extract product information and images from Internet shopping websites such as eba.

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){

Php Curl Web Scraping Examples

$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()).'/';

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);

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.

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.

Php Curl Web Scraping Example Pdf

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.

Artículo en español: Crear un Simple Web Crawler en PHP
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