Web crawler-How to crawl a page's verification code with PHP

需要点击后

I don't think it's hard to crack.
How to click to return a picture of it to get its picture

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需要点击后

I don't think it's hard to crack.
How to click to return a picture of it to get its picture

You use Firebug to see the request address where he gets the verification code. Generally this possible Ajax. If you just get the picture, you just need to brush the link to get the verification code.

A click should trigger an AJAX, grab it, and request the URL directly.

Directly get the URL that is triggered after the click is available. As for your t=xxx parameters, you can look at the page code, generally used in the verification code is random number or the current timestamp (in order to prevent the cache, the general parameter is not the same request will not be the cache), if it is from the server dynamically generated, and then write more requests to get parameters

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