


CURL application in PHP and based on modified Google implementation
能做什么
<code>PHP中的curl库最基本的用途就是去简单有效地*抓取网页的内容*,然后利用抓取到的网页数据经程序的方式进行处理和分析,最终得到你所想要的数据。当然了,这是最基本的用法,还有其他复杂有趣的用途,这取决于你的curl_setopt()行数的设置 </code>
怎么用
<code>首先,你的PHP中必须安装有curl的扩展插件,即phpinfo中有如下显示  然后就可以开始使用了,具体步骤: 1.用curl_init()初始化一个curl会话 2.通过curl_setopt()来设置需要的全部选项 3.用curl_exec()来执行会话 4.执行完后使用curl_close()关闭会话 </code>
ps:curl_setopt()是curl使用的关键,很多复杂的用法都是基于此
一个简单的例子
<code><?php <span>//初始化一个curl对象<span>$curl</span>=curl_init(<span>"http://www.baidu.com"</span>); <span>//将抓取的数据已文本的形式保存</span><span>$fp</span>=<span>fopen</span>(<span>"test.txt"</span>); <span>//设置curl_setopt()参数</span> curl_setopt(<span>$ch</span>,CURLOPT_FILE,<span>$fp</span>); curl_setopt(<span>$ch</span>,CURLOPT_HEADER,<span>0</span>); <span>//执行curl_exec();</span> curl_exec(<span>$ch</span>); <span>//关闭curl会话</span> curl_exec(<span>$ch</span>); curl_close(<span>$ch</span>); <span>fclose</span>(<span>$fp</span>);</code>
以上例子来自官方文档
利用CURL实现抓取GOOGLE的host脚本
<code><?php <span>//初始化curl对话<span>$curl</span>=curl_init(); <span>//设置curl_setopt</span> curl_setopt(<span>$curl</span>, CURLOPT_URL, <span>'http://www.360kb.com/kb/2_122.html'</span>); curl_setopt(<span>$curl</span>,CURLOPT_HEADER,<span>0</span>); curl_setopt(<span>$curl</span>, CURLOPT_RETURNTRANSFER, true); <span>//执行curl</span><span>$data</span>=curl_exec(<span>$curl</span>); <span>//关闭curl资源</span> curl_close(<span>$curl</span>); <span>//清楚HTML标签</span><span>$data</span>=strip_tags(<span>$data</span>); <span>//处理的读入数据</span><span>$data</span>=substr(<span>$data</span>, strpos(<span>$data</span>, <span>'#google hosts'</span>)); <span>$data</span>=substr(<span>$data</span>,<span>0</span>,strpos(<span>$data</span>, <span>'#google hosts 2015 end'</span>)); <span>$data</span>=str_replace(<span>' '</span>, <span>' '</span>, <span>$data</span>); <span>//写入host</span><span>$host</span>=file_get_contents(<span>"C:\\Windows\\System32\\drivers\\etc\\HOSTS"</span>); <span>$host</span>=substr(<span>$host</span>,<span>0</span>,strpos(<span>$host</span>, <span>'#google hosts'</span>)); <span>$host</span>.=<span>$data</span>; <span>$fh</span>=<span>fopen</span>(<span>"C:\\Windows\\System32\\drivers\\etc\\HOSTS"</span>, <span>'w'</span>); <span>fwrite</span>(<span>fopen</span>(<span>"C:\\Windows\\System32\\drivers\\etc\\HOSTS"</span>, <span>'w'</span>), <span>$host</span>); <span>fclose</span>(<span>$fh</span>); </code>
以上就介绍了PHP中CURL应用与基于的修改Google实现,包括了方面的内容,希望对PHP教程有兴趣的朋友有所帮助。

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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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