如果你试图用cookies登录网站。

这段代码:

if ($server_output == "OK") { ... } else { ... }

如果您尝试登录，它可能无法工作，因为许多网站返回状态200，但发布不成功。

检查登录帖子是否成功的简单方法是检查它是否再次设置cookie。如果在输出中有一个Set-Cookies字符串，这意味着帖子没有成功，它开始一个新的会话。

同样，帖子可以成功，但是状态可以重定向，而不是200。

为了确保帖子成功，试试下面的方法:

Follow location在post之后，所以它会转到post重定向到的页面:

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

然后检查请求中是否存在新的cookie:

if (!preg_match('/^Set-Cookie:\s*([^;]*)/mi', $server_output)) 

{echo 'post successful'; }

else { echo 'not successful'; }

可以通过以下方式轻松到达:

<?php

$post = [
    'username' => 'user1',
    'password' => 'passuser1',
    'gender'   => 1,
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.domain.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post));
$response = curl_exec($ch);
var_export($response);

1.一步一步

初始化cURL会话:

$url = "www.domain.com";
$ch = curl_init($url);

如果你的请求有报头，如承载令牌或定义JSON内容，你必须将HTTPHEADER选项设置为cURL:

$token = "generated token code";
curl_setopt(
    $ch, 
    CURLOPT_HTTPHEADER, 
    array(
        'Content-Type: application/json', // for define content type that is json
        'bearer: '.$token, // send token in header request
        'Content-length: 100' // content length for example 100 characters (can add by strlen($fields))
    )
);

如果你想在输出中包含报头，将CURLOPT_HEADER设置为true:

curl_setopt($ch, CURLOPT_HEADER, false);

设置RETURNTRANSFER选项为true以字符串形式返回传输，而不是直接输出:

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

要检查SSL对端证书中是否存在公共名称，可以设置为0(不检查名称)、1(cURL 7.28.1中不支持)、2(默认值，用于生产模式):

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);

对于cURL将字段作为数组发布:

$fields = array(
    "username" => "user1",
    "password" => "passuser1",
    "gender" => 1
);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);

执行cURL并返回字符串。根据你的资源，这将返回类似result=OK的输出:

$result = curl_exec($ch);

关闭cURL资源，释放系统资源:

curl_close($ch);

2.作为一个类使用

可以扩展的整个call_cURL类:

class class_name_for_call_cURL {
    protected function getUrl() {
        return "www.domain.com";
    }

    public function call_cURL() {
        $token = "generated token code";

        $fields = array(
            "username" => "user1",
            "password" => "passuser1",
            "gender" => 1
        );

        $url = $this->getUrl();
        $output = $this->_execute($fields, $url, $token);
        
        // if you want to get json data
        // $output = json_decode($output);
            
        if ($output == "OK") {
            return true;
        } else {
             return false;
        }
    }

    private function _execute($postData, $url, $token) {
        // for sending data as json type
        $fields = json_encode($postData);

        $ch = curl_init($url);
        curl_setopt(
            $ch, 
            CURLOPT_HTTPHEADER, 
            array(
                'Content-Type: application/json', // if the content type is json
                'bearer: '.$token // if you need token in header
            )
        );
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);

        $result = curl_exec($ch);
        curl_close($ch);

        return $result;
    }
}

使用类并调用cURL:

$class = new class_name_for_call_cURL();
var_dump($class->call_cURL()); // output is true/false

3.一个函数

在任何需要的地方使用的函数:

function get_cURL() {

        $url = "www.domain.com";
        $token = "generated token code";

        $postData = array(
            "username" => "user1",
            "password" => "passuser1",
            "gender" => 1
        );

        // for sending data as json type
        $fields = json_encode($postData);

        $ch = curl_init($url);
        curl_setopt(
            $ch, 
            CURLOPT_HTTPHEADER, 
            array(
                'Content-Type: application/json', // if the content type is json
                'bearer: '.$token // if you need token in header
            )
        );
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);

        $result = curl_exec($ch);
        curl_close($ch);

        return $result;
}

这个函数可以通过以下方式使用:

var_dump(get_cURL());

curlPost('google.com', [
    'username' => 'admin',
    'password' => '12345',
]);


function curlPost($url, $data) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    $response = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);
    if ($error !== '') {
        throw new \Exception($error);
    }

    return $response;
}

Curl Post +错误处理+设置头[感谢@mantas-d]:

function curlPost($url, $data=NULL, $headers = NULL) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    if(!empty($data)){
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    }

    if (!empty($headers)) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }

    $response = curl_exec($ch);

    if (curl_error($ch)) {
        trigger_error('Curl Error:' . curl_error($ch));
    }

    curl_close($ch);
    return $response;
}


curlPost('google.com', [
    'username' => 'admin',
    'password' => '12345',
]);

最简单的是以application/json的形式发送数据。这将接受一个数组作为输入，并正确地将其编码为json字符串:

$data = array(
    'field1' => 'field1value',
    'field2' => 'field2value',
)

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type:application/json',
));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$resultStr = curl_exec($ch);
return json_decode($resultStr, true);