1.cURL介绍
cURL 是一个利用URL语法规定来传输文件和数据的工具,支持很多协议,如HTTP、FTP、TELNET等。最爽的是,PHP也支持 cURL 库。本文将介绍 cURL 的一些高级特性,以及在PHP中如何运用它。
2.基本结构
在学习更为复杂的功能之前,先来看一下在PHP中建立cURL请求的基本步骤:
(1)初始化
curl_init()
(2)设置变量
curl_setopt() 。最为重要,一切玄妙均在此。有一长串cURL参数可供设置,它们能指定URL请求的各个细节。要一次性全部看完并理解可能比较困难,所以今天我们只试一下那些更常用也更有用的选项。
(3)执行并获取结果
curl_exec()
(4)释放cURL句柄
curl_close()
3.cURL实现Get和Post
3.1 Get方式实现
//初始化
$ch = curl_init();
//设置选项,包括URL
curl_setopt($ch, CURLOPT_URL, "http://www.jb51.net");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
//执行并获取HTML文档内容
$output = curl_exec($ch);
//释放curl句柄
curl_close($ch);
//打印获得的数据
print_r($output);
3.2 Post方式实现
$url = "http://localhost/web_services.php";
$post_data = array ("username" => "bob","key" => "12345");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// post数据
curl_setopt($ch, CURLOPT_POST, 1);
// post的变量
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
$output = curl_exec($ch);
curl_close($ch);
//打印获得的数据
print_r($output);
以上方式获取到的数据是json格式的,使用json_decode函数解释成数组。
$output_array = json_decode($output,true);
如果使用json_decode($output)解析的话,将会得到object类型的数据。

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