PHP_CURL1 simulated POST login_PHP tutorial

CURL Introduction:

CURL allows you to connect and communicate with various servers using various types of protocols. Currently supported protocols include: http, https, ftp, gopher, telnet, dict, file, ldap, and also supports HTTPS authentication. HTTP POST, HTTP PUT, FTP upload (this can also be done through PHP's FTP extension), HTTP form-based upload, proxy, cookies and username + password authentication. (Excerpted from the manual)

In short, CURL is very powerful and can achieve many functions that the file_get_contents function cannot.

I won’t go into details about the principles, let’s talk about the code here.

CURL simulated login:

First, create two files in your project, login.php (submit login), validate.php (verify), code list:

login.php

<?php
header('Content-type:text/html;Charset=utf-8');
$user = 'lee';       //登陆用户名
$pass = '123456';    //登陆密码
$va_url = 'http://localhost/validate.php';            //验证的 url 链接地址
$post_fields = "loginname={$user}&loginpass={$pass}"; //post提交信息串
$curl = curl_init(); //初始化一个cURL会话，必有
//curl_setopt()函数用于设置 curl 的参数，其功能非常强大，具体看手册
curl_setopt($curl, CURLOPT_URL, $va_url);      //设置验证登陆的 url 链接
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 0); //设置结果保存在变量中，还是输出，默认为0（输出）
curl_setopt($curl, CURLOPT_POST, 1);           //模拟post提交
curl_setopt($curl, CURLOPT_POSTFIELDS, $post_fields); //设置post串
$data = curl_exec($curl);  //执行此cURL会话，必有
curl_close($curl);         //关闭会话

validate.php

<?php
header('Content-Type:text/html;Charset=utf-8');
if ($_POST['loginname'] == 'lee' && $_POST['loginpass'] == '123456') {
    echo '<script>alert("登陆成功！");</script>';
} else {
    echo '<script>alert("登陆失败！");</script>';
}

If the login is successful, JS will pop up "Login successful"; if the login fails, JS will pop up "Login failed".

Note: Original article, please indicate the source when reprinting: http://blog.csdn.net/liruxing1715/article/details/18551621

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