代码如下

/***
 * 万能短网址还原函数
 * @param $shortUrl 短网址
 * @return 原始网址 | 空（还原失败或非短网址）
 */function restoreUrl($shortUrl) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $shortUrl);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0');
    curl_setopt($curl, CURLOPT_HEADER, true);
    curl_setopt($curl, CURLOPT_NOBODY, false);
    curl_setopt($curl, CURLOPT_TIMEOUT, 15);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($curl, CURLOPT_ENCODING, 'gzip');
    $data = curl_exec($curl);
    $curlInfo = curl_getinfo($curl);
    curl_close($curl);    if($curlInfo['http_code'] == 301 || $curlInfo['http_code'] == 302) {        return $curlInfo['redirect_url'];
    }    return '';
}

使用方法

$shortUrl = 'https://url.cn/54VbB8h';    
// 要还原的短网址
$orinalUrl = restoreUrl($shortUrl);
if($orinalUrl) {    
echo "短网址 {$shortUrl} 的还原结果：{$orinalUrl}";
} else {  
echo "短网址还原失败";
}

<?php
/**
 * @link https://www.ilingku.com
 * @msg PHPCurl封装的方法
 */
function teacher_curl($url, $paras = array()){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);    if (@$paras['Header']) {
        $Header = $paras['Header'];
    } else {
        $Header[] = "Accept:*/*";
        $Header[] = "Accept-Encoding:gzip,deflate,sdch";
        $Header[] = "Accept-Language:zh-CN,zh;q=0.8";
        $Header[] = "Connection:close";
    }
    curl_setopt($ch, CURLOPT_HTTPHEADER, $Header);    if (@$paras['ctime']) { // 连接超时
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $paras['ctime']);
    } else {
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    }    if (@$paras['rtime']) { // 读取超时
        curl_setopt($ch, CURLOPT_TIMEOUT, $paras['rtime']);
    }    if (@$paras['post']) {
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $paras['post']);
    }    if (@$paras['header']) {
        curl_setopt($ch, CURLOPT_HEADER, true);
    }    if (@$paras['cookie']) {
        curl_setopt($ch, CURLOPT_COOKIE, $paras['cookie']);
    }    if (@$paras['refer']) {        if ($paras['refer'] == 1) {
            curl_setopt($ch, CURLOPT_REFERER, 'http://m.qzone.com/infocenter?g_f=');
        } else {
            curl_setopt($ch, CURLOPT_REFERER, $paras['refer']);
        }
    }    if (@$paras['ua']) {
        curl_setopt($ch, CURLOPT_USERAGENT, $paras['ua']);
    } else {
        curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36");
    }    if (@$paras['nobody']) {
        curl_setopt($ch, CURLOPT_NOBODY, 1);
    }
    curl_setopt($ch, CURLOPT_ENCODING, "gzip");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    if (@$paras['GetCookie']) {
        curl_setopt($ch, CURLOPT_HEADER, 1);
        $result = curl_exec($ch);
        preg_match_all("/Set-Cookie: (.*?);/m", $result, $matches);
        $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
        $header = substr($result, 0, $headerSize); //状态码
        $body = substr($result, $headerSize); //响应内容
        $ret = ["Cookie" => $matches, "body" => $body, "code" => $header];
        curl_close($ch);
        return $ret;
    }
    $ret = curl_exec($ch);
    if (@$paras['loadurl']) {
        $Headers = curl_getinfo($ch);
        $ret = $Headers['redirect_url'];
    }
    curl_close($ch);
    return $ret;
}

使用方法：

GET访问

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com");

POST访问

echo teacher_curl("https://api.baidu.com/api/beian.php",[    
    'post'=>[        
    'url'=>'qq.com'
  ]
]);

或

echo teacher_curl("https://api.baidu.com/api/beian.php",[    
    'post'=>'url=qq.com'
]);

携带Cookie访问

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'cookie'=>'cookie内容'
]);

模拟访问来源Refer

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'refer'=>' 
]);

模拟UseaAgent

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'ua'=>'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
]);

文件上传

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'post'=>[        
        'file'=>new CURLFile(realpath("Curl.jpg"))
    ]
]);

或：

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'post'=>new CURLFile(realpath("Curl.jpg"))
]);

获取301跳转地址

echo teacher_curl("https://baidu.com/",[    
    'loadurl'=>1
]);

查看返回Header信息

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'header'=>1]
);

设置请求头信息

echo teacher_curl("https://api.baidu.com/api/beian.php?url=qq.com",[    
    'Header'=>[        
        'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
        accept-encoding: gzip, deflate, br
        accept-language: zh-CN,zh;q=0.9
        cache-control: max-age=0'
    ]
]);

获取POST以后返回的Header、Body、Cookie内容

echo teacher_curl("https://api.ilingku.com/api/beian.php?url=qq.com",[    
    'post'=>[        
        'user'=>123456,        
        'pwd'=>123
    ],    
    'GetCookie'=>1
]);