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1. Php Web Scraping Tutorial
2. Php Scraping Library
3. Web Scraping Php Curl
4. Web Scraping With Php

1. Web scraping is a great way to get the data you need from websites, but there are many programming languages to choose from. These are the reasons why PHP is still the best programming language to learn when it comes to web harvesting. What Programming Language Should I Learn?
2. Easy web scraping with PHP February 17th, 2008 Web scraping is a technique of web development where you load a web page and 'scrape' the data off the page to be used elsewhere. It's not pretty, but sometimes scraping is the only way to access data or content from a web site that doesn't provide RSS or an open API.

How to use Web Scraper? There are only a couple of steps you will need to learn in order to master web scraping: 1. Install Web Scraper and open Web Scraper tab in developer tools (which has to be placed at the bottom of the screen for Web Scraper to be visible); 2. Create a new sitemap; 3. Add data extraction selectors to the sitemap; 4.

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.

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();

Php Web Scraping Tutorial

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’));

Php Scraping Library

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.

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
También puede leer artículos de web scraping en el Website Oficial

Web Scraping Php Curl

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