curl 基础例子

只要你编译完的PHP设置了支持 cURL 扩展，你就可以开始使用cURL函数了。使用 cURL 函数的基本思想是先使用 curl_init() 初始化 cURL会话，接着可以通过 curl_setopt() 设置需要的全部选项，然后使用 curl_exec() 来执行会话，当执行完会话后使用 curl_close() 关闭会话。这是一个使用 cURL 函数获取 example.com 主页保存到文件的例子：

Example #1 使用 PHP cURL 模块获取 example.com 的主页


<?php

$ch = curl_init("http://www.example.com/");
$fp = fopen("example_homepage.txt", "w");

curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);

curl_exec($ch);
if(curl_error($ch)) {
    fwrite($fp, curl_error($ch));
}
curl_close($ch);
fclose($fp);
?>

User Contributed Notes

Roberto Braga 01-Apr-2015 09:45


It is important to notice that when using curl to post form data and you use an array for CURLOPT_POSTFIELDS option, the post will be in multipart format



<?php

$params=['name'=>'John', 'surname'=>'Doe', 'age'=>36)

$defaults = array(

CURLOPT_URL => 'http://myremoteservice/', 

CURLOPT_POST => true,

CURLOPT_POSTFIELDS => $params,

);

$ch = curl_init();

curl_setopt_array($ch, ($options + $defaults));

?>

This produce the following post header:



--------------------------fd1c4191862e3566

Content-Disposition: form-data; name="name"



Jhon

--------------------------fd1c4191862e3566

Content-Disposition: form-data; name="surnname"



Doe

--------------------------fd1c4191862e3566

Content-Disposition: form-data; name="age"



36

--------------------------fd1c4191862e3566--



Setting CURLOPT_POSTFIELDS as follow produce a standard post header



CURLOPT_POSTFIELDS => http_build_query($params),



Which is:

name=John&surname=Doe&age=36



This caused me 2 days of debug while interacting with a java service which was sensible to this difference, while the equivalent one in php got both format without problem.