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curl和libcurl的区别简介

Jun 06, 2016 pm 08:02 PM
curl libcurl the difference

这篇文章主要介绍了curl和libcurl的区别简介,本文讲解了curl简介、libcurl简介、curl与libcurl对比、“curl”的不同意思、PHP中使用curl和libcurl等内容,这么多

curl简介

curl是利用URL语法在命令行方式下工作的开源文件传输工具。
它支持很多协议:DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP。
curl同样支持SSL证书,HTTP POST, HTTP PUT,FTP上传,,基于表单的HTTP上传,代理(proxies)、cookies、用户名/密码认证(Basic, Digest, NTLM等)、下载文件断点续传,上载文件断点续传(file transfer resume),http代理服务器管道(proxy tunneling)以及其他特性。
curl是瑞典curl组织开发的,curl的官网是,可以从官网获取它的源代码和相关说明。

libcurl简介

libcurl为一个免费开源的,客户端url传输库,支持DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet and TFTP等协议。
同curl一样,libcurl也支持SSL证书,HTTP POST, HTTP PUT,FTP上传,基于表单的HTTP上传,代理(proxies)、cookies、用户名/密码认证(Basic, Digest, NTLM等)、下载文件断点续传,上载文件断点续传(file transfer resume),http代理服务器管道(proxy tunneling)等。

libcurl是高度可移植的,可以工作在不同的平台上,支持Windows,Unix,Linux等。

libcurl是免费的,线程安全的,IPV6兼容的,同事它还有很多其他非常丰富的特性。libcurl已经被很多知名的大企业以及应用程序所采用。
可以在这里获取libcurl的源码及相关文档。

curl与libcurl对比

相同点

curl和libcurl都可以利用多种多样的协议来传输文件,包括HTTP, HTTPS, FTP, FTPS, GOPHER, LDAP, DICT, TELNET and FILE等。

不同点

curl是命令行工具,可以通过shell或脚本来运行curl。curl底层所使用的库是libcurl。
libcurl是一个库,通常与别的程序绑定在一起使用,如命令行工具curl就是封装了libcurl库。所以我们也可以在你自己的程序或项目中使用libcurl以获得类似CURL的强大功能。接下来将要介绍的PHP扩展就是对curl的一个封装。

几个名词

“curl”的不同意思

1.curl指的是curl命令行工具,可以从命令行或者脚本或者批处理文件中运行curl。curl创建于1998年,并且提供了100多个选项去控制它。
2.cURL是一个软件项目的名字。该软件项目包含了上面所说的curl和libcurl,并且都是开源的。
3.CURL通常用作PHP中libcurl扩展的名字。这个扩展确保了PHP程序员在程序中可以访问libcurl库所提供的功能。

curl—命令行工具

1.命令行工具,可以从shell或者脚本中运行该工具。
2.提供了130多种不同的“flags”
3.通常被用来模拟浏览器的行为
4.跨平台

libcurl—库

1.用作其他程序的开发库
2.可以与许多语言想结合,如PHP、C++
3.跨平台
4.提供了多种不同的使用它的APIs

PHP中使用curl和libcurl

PHP中使用curl

在PHP中使用curl非常简单,只要调用PHP中几个执行系统命令的相关函数即可。
代码示例:

复制代码 代码如下:


$baidu=shell_exec("/usr/bin/curl -L "); 
var_dump($baidu);

PHP中使用libcurl

在PHP中使用libcurl,也就是我们通常所说的PHP中的“curl”。这部分的内容会在以后的文章中给出,这里只写出一个示例代码:

复制代码 代码如下:


// FTP this script to a server
$fp = fopen(__FILE__, "r");
$url = "ftp://username:password@mydomain.com:21/path/to/newfile.php";
$ch = curl_init();   
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_UPLOAD, 1);
curl_setopt($ch, CURLOPT_INFILE, $fp);
curl_setopt($ch, CURLOPT_FTPASCII, 1);
curl_setopt($ch, CURLOPT_INFILESIZE, filesize(__FILE__));
$result = curl_exec($ch);
curl_close($ch);

使用curl还是libcurl?

使用curl还是libcurl这个需要根据具体的情况而定。例如,当有一个定时脚本在远程服务器的文件改变时发送邮件或者当前PHP环境不支持libcurl时,我们应该使用curl。否则,我们使用libcurl即可。

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