本文实例讲述了CodeIgniter实现从网站抓取图片并自动下载到文件夹里的方法。分享给大家供大家参考。具体如下:
因为某网站看图比较坑爹,要一页一页的翻页。。。。所以。。。。就写了这么个东西
(我是产品不是程序员)运行速度简直无法忍受,而且经常会有错误发生,所以希望大家帮忙改进(PHP)。
当然也欢迎看到PYTHON,GOLANG的版本~~^_^
1. controllers:
$this->load->helper('date'); $this->load->helper('phpQuery'); //我是把phpQuery单文件放到helper里了
2. view:
这里只是为了快速出产品,所以直接在VIEW里写的代码,请无视变量名。。。
<?php $imageslist = phpQuery::newDocumentFile('http://g.e-hentai.org/g/xxxxx/xxxxxxx/'); //首页 $pn = 1;//页数 $ps = $imageslist->find('.ptt td a');//从首页抓页面导航 //从页面导航开始获取页面内容 foreach($ps as $p) { echo '第'.$pn++.'页:<a href="'.pq($p)->attr("href").'"/></br>'; $imagesnow = phpQuery::newDocumentFile(pq($p)->attr("href")); //单页内容 $images = $imagesnow->find('#gdt a');//抓取图片页列表 foreach($images as $image) { echo '<a href="'.pq($image,$imagesnow)->attr("href").'"/></br>'; $imagebigs = phpQuery::newDocumentFile(pq($image,$imagesnow)->attr("href")); //获取单图片页地址 echo '<img src="'.$imagebigs- alt="CodeIgniter实现从网站抓取图片并自动下载到文件夹里的方法_PHP" >find('#i3 img')->attr('src').'"></br>';//输出图片 ob_start(); readfile($imagebigs->find('#i3 img')->attr('src')); $img = ob_get_contents(); ob_end_clean(); $filename='img/'.now().'.jpg'; $f=fopen($filename,'a'); fwrite($f,$img); fclose($f); } } ?>
希望本文所述对大家基于CodeIgniter的php程序设计有所帮助。

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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