php 中使用curl的一般步骤

1. curl_init() 初始化curl句柄
2. curl_setopt() 设置请求参数
3. curl_exec() 执行并获取结果
4. curl_close() 关闭crul句柄

CURL GET请求

<?php
/**
*封装cURL的调用接口，get的请求方式。
*/
function GetMetod($url, $data = [], $header = [], $timeout = 5){
if($url == "" || $timeout <= 0){   
return false;
}
$url = $url.'?'.http_build_query($data);  //http_build_query()传入关联数组，处理请求参数和数据
$curl = curl_init();

curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书
curl_setopt($curl, CURLOPT_RETURNTRANSFER,true); //设置为true将请求结果保存到变量中，否则直接输出
curl_setopt($curl, CURLOPT_TIMEOUT, (int)$timeout);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header); //添加自定义httpheader

return curl_exec($curl);
}
?>

CURL POST请求

<?php
/**
**封装cURL的调用接口，post的请求方式。
**/

function PostMethod($url, $data = [], $header = [], $timeout = 5){
if($url == '' || $timeout <=0){  
return false;
}
$curl = curl_init();

curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书
curl_setopt($curl, CURLOPT_POST,true); //设置POST请求
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($curl, CURLOPT_TIMEOUT,(int)$timeout);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header); //添加自定义httpheader

return curl_exec($curl);
}
?>

CURL POST JSON数据

<?php 
    $data='{"name":"jmy","msg":"hello"}';
    $ch = curl_init(); 

    curl_setopt($ch, CURLOPT_URL, $url); 
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json', 'Content-Length:' . strlen($data)));
    curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    $output = curl_exec($ch); 

    echo $output;
    curl_close($ch);      
?>

CURL COOKIE

curl_setopt($curl,CURLOPT_COOKIESESSION,true);
curl_setopt($curl,CURLOPT_COOKIEFILE,'mcookie');
curl_setopt($curl,CURLOPT_COOKIEJAR,'mcookie');
curl_setopt($curl,CURLOPT_COOKIE,session_name().'='.session_id());

在 curl_exec() 执行后还可以使用 curl_getinfo() 函数获取 CURL 请求输出的相关信息。