我很惊讶没有人建议file_get_contents:

$url = "http://www.example.com";
$parameters = array('username' => 'user1', 'password' => 'passuser1', 'gender' => '1');
$options = array('http' => array(
    'header'  => 'Content-Type: application/x-www-form-urlencoded\r\n',
    'method'  => 'POST',
    'content' => http_build_query($parameters)
));

$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

这很简单，很有效;我把它用在两端都能控制代码的环境中。

更好的方法是使用json_decode(并设置代码以返回JSON)

$result = json_decode(file_get_contents($url, false, $context), TRUE);

这种方法在幕后调用curl，但不需要经历那么多困难。

从Stack Overflow上其他地方的原始答案提炼出来的答案: PHP将变量发送到file_get_contents()

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);

程序上的

// set post fields
$post = [
    'username' => 'user1',
    'password' => 'passuser1',
    'gender'   => 1,
];

$ch = curl_init('http://www.example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

// execute!
$response = curl_exec($ch);

// close the connection, release resources used
curl_close($ch);

// do anything you want with your response
var_dump($response);

面向对象的

<?php

// mutatis mutandis
namespace MyApp\Http;

class CurlPost
{
    private $url;
    private $options;
           
    /**
     * @param string $url     Request URL
     * @param array  $options cURL options
     */
    public function __construct($url, array $options = [])
    {
        $this->url = $url;
        $this->options = $options;
    }

    /**
     * Get the response
     * @return string
     * @throws \RuntimeException On cURL error
     */
    public function __invoke(array $post)
    {
        $ch = \curl_init($this->url);
        
        foreach ($this->options as $key => $val) {
            \curl_setopt($ch, $key, $val);
        }

        \curl_setopt($ch, \CURLOPT_RETURNTRANSFER, true);
        \curl_setopt($ch, \CURLOPT_POSTFIELDS, $post);

        $response = \curl_exec($ch);
        $error    = \curl_error($ch);
        $errno    = \curl_errno($ch);
        
        if (\is_resource($ch)) {
            \curl_close($ch);
        }

        if (0 !== $errno) {
            throw new \RuntimeException($error, $errno);
        }
        
        return $response;
    }
}

使用

// create curl object
$curl = new \MyApp\Http\CurlPost('http://www.example.com');

try {
    // execute the request
    echo $curl([
        'username' => 'user1',
        'password' => 'passuser1',
        'gender'   => 1,
    ]);
} catch (\RuntimeException $ex) {
    // catch errors
    die(sprintf('Http error %s with code %d', $ex->getMessage(), $ex->getCode()));
}

旁注:最好是使用getResponse()方法创建某种名为AdapterInterface的接口，并让上面的类实现它。然后，您总是可以将这个实现与您喜欢的另一个适配器交换，而不会对应用程序产生任何副作用。

使用HTTPS /加密流量

在Windows操作系统下，PHP中的cURL通常会有问题。在尝试连接到受https保护的端点时，您将得到一个错误，告诉您证书验证失败。

大多数人在这里做的是告诉cURL库简单地忽略证书错误并继续(curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);)。因为这将使你的代码正常工作，你引入了巨大的安全漏洞，并使恶意用户能够对你的应用程序执行各种攻击，如Man In The Middle攻击或类似的攻击。

永远，永远不要那样做。相反，你只需要修改你的PHP .ini，并告诉PHP你的CA证书文件在哪里，让它正确地验证证书:

; modify the absolute path to the cacert.pem file
curl.cainfo=c:\php\cacert.pem

最新的音乐会。pem可以从互联网上下载，也可以从您喜欢的浏览器中提取。当更改任何php.ini相关设置时，记得重新启动web服务器。

<?php
//
// A very simple PHP example that sends a HTTP POST to a remote site
//

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"http://www.example.com/tester.phtml");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            "postvar1=value1&postvar2=value2&postvar3=value3");

// In real life you should use something like:
// curl_setopt($ch, CURLOPT_POSTFIELDS, 
//          http_build_query(array('postvar1' => 'value1')));

// Receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec($ch);

curl_close($ch);

// Further processing ...
if ($server_output == "OK") { ... } else { ... }
?>

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());

发送表单和原始数据的示例:

$curlHandler = curl_init();

curl_setopt_array($curlHandler, [
    CURLOPT_URL => 'https://postman-echo.com/post',
    CURLOPT_RETURNTRANSFER => true,

    /**
     * Specify POST method
     */
    CURLOPT_POST => true,

    /**
     * Specify array of form fields
     */
    CURLOPT_POSTFIELDS => [
        'foo' => 'bar',
        'baz' => 'biz',
    ],
]);

$response = curl_exec($curlHandler);

curl_close($curlHandler);

echo($response);