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php中请求url的五种方法

墨辰丷

墨辰丷

发布时间:2018-05-19 13:59:35

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来源于php中文网

原创

本篇文章主要介绍php中请求url的五种方法,感兴趣的朋友参考下,希望对大家有所帮助。

五种方法:

  • 前三种都是php基本的文件操作函数

  • curl()是php扩展需要开启,linux下需要安装

  • exec()执行的是linux命令行下的命令wget下载远程文件

    立即学习PHP免费学习笔记(深入)”;

其中wget命令在本地虚机测试请求http://www.baidu.com时,没有成功,在远程服务器上却可以,考虑时DNS解析的问题,于是直接请求IP成功下载了index.html的文件。

这里只提供了方法,其中的优缺点需要详细了解每一个方法的功能和缺陷。

一、fopen()函数

$file = fopen("http://www.jb51.net", "r") or die("打开远程文件失败!");
while (!feof($file)) {
 $line = fgets($file, 1024);
 //使用正则匹配标题标记
 if (preg_match("/(.*)<\/title>/i", $line, $out)) { 
 $title = $out[1]; //将标题标记中的标题字符取出
 break; //退出循环,结束远程文件读取
 }
}
fclose($file);</pre><p></p>
<p><span style="color: #ff0000"><strong>二、file()函数</strong></span></p><div class="aritcle_card flexRow">
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<p class="jb51code"></p><pre class="brush:php;toolbar:false">$lines = file("http://www.jb51.net/article/48866.htm");
readfile(http://www.jb51.net/article/48866.htm);</pre><p></p>
<p><span style="color: #ff0000"><strong>三、file_get_contents()函数</strong></span></p>
<p class="jb51code"></p><pre class="brush:php;toolbar:false">$content = file_get_contents(http://www.jb51.net/article/48866.htm);</pre><p></p>
<p><span style="color: #ff0000"><strong>四、curl() 请求远程url数据</strong></span></p>
<p class="jb51code"></p><pre class="brush:php;toolbar:false">$url = "http://www.baidu.com";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$contents = curl_exec($ch);
curl_close($ch);</pre><p></p>
<p><span style="color: #ff0000"><strong>五、exec() 执行命令行命令</strong></span></p>
<p class="jb51code"></p><pre class="brush:php;toolbar:false">//exec("wget 220.181.111.188");
shell_exec("wget 220.181.111.188");</pre><p></p>
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