Web Scraping Php

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Tuesday, June 18, 2019

Web Scraping Using PHP We will explore some PHP libraries which can be used to understand how to use the HTTP protocol as far as our PHP code is concerned, how we can steer clear of the built-in API wrappers and in its place, think of using something that is way more simple and easy to manage for web scraping. PHP web scraping. Ask Question Asked 8 years, 8 months ago. Active 3 years, 6 months ago. Viewed 745 times 3. I use php web scraping, and I want to get the price (3.

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.

Php

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

Scraping Bee

{

$temp = explode($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); Download adobe cs6 free for mac.

}

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){ Rise of nations gold for mac.

$ch = curl_init();

$timeout = 5;

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);

Web Scraping Using Php

$file = curl_exec($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); Driver pack for mac os.

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;

Web Scraping In Php

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.

Easy Web Scraping Using Php

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
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