PHP Web Crawling: Simple Data Extraction

Hands-on with PHP to teach you to grab web page data

Brothers who engage in web crawling know that many websites have added anti-climbing mechanisms, and that writing a crawling script in PHP will not be blocked by the IP address.Decentralization of request pressureWe're going to focus on how to use ipipgo's proxy service to get this done.

What the basic version of the crawl code looks like

Let's start with the simplest PHP crawler example, the kind that doesn't use proxies:

$url = 'http://目标网站.com';
$html = file_get_contents($url); echo $html; $html = file_get_contents($url)
echo $html.

This kind of writing will be blocked in three days, especially if you visit frequently. It's like using the same cell phone number to send advertisement text messages to people every day, sooner or later, they will be pulled black.

The right way to open a proxy IP

Showing you guys how to transform the code with ipipgo's proxy:

$proxy = '121.36.88.178:31152'; //taken from ipipgo backend
$context = stream_context_create([
    'http' => [
        'proxy' => "tcp://$proxy",
        'request_fulluri' => true
    ]
]);
$html = file_get_contents('http://目标网站.com', false, $context);

Here's the kicker: remember to go to the ipipgo back office and put theDynamic IP PoolOpen, their IP survival time can last up to 3-6 hours, much more reliable than those that expire in half an hour.

A practical guide to avoiding the pit

Experienced Drivers

1. don't save that traffic money. ipipgo.quantity-based billing packageEspecially friendly to small projects
2. Grab e-commerce price of this high-frequency operation, remember to set the interval of more than 5 seconds
3. When encountering problems with SSL certificates, add averify_peer=>falsetemporary emergency relief

Frequently Asked Questions QA

Q: What should I do if I slow down after using a proxy?
A: change ipipgo'sBGP Multi-Line Server RoomThe measured latency can be reduced to less than 200ms.

Q: Which agent package should I choose?
A: the test period with the amount of payment, the official project directly monthly, they buy half a year to send two months is quite cost-effective!

Q: What about pages that need to be processed for JavaScript rendering?
A: You can work with tools like puppeteer, remember to turn on the ipipgo backgroundLong Session Mode

Advanced Tips and Tricks

Add a failure retry mechanism to the code, using ipipgo's list of alternate IPs:

$proxies = ['111.22.33.44:1234','222.33.44.55:5678']; // multiple IPs
foreach($proxies as $proxy){
    try {
        // Put the previous proxy code here
        break; }
    } catch(Exception $e) {
        continue; }
    }
}

This routine can make the success rate directly doubled, especially against those anti-climbing strict website, pro-test effective.