PHP file_get_contents 简单函数

1. [代码][PHP]代码    

/**
 * file_get_contents 函数
 * @param string $url @要访问的URL
 * @param array $post_data @请求的数据（数组）
 * @param string $method @请求方式 默认 post
 * @param string $content_type
 * @return bool|string
 */
function file_contents_post($url = '', $post_data = array(), $method = 'POST', $content_type = 'form')
{
    $sFile = false;
    if(!empty($url)){
        $type = [
            'form' => "application/x-www-form-urlencoded",
            'json' => "application/json",
        ];
        $ua = $_SERVER['HTTP_USER_AGENT'] ? $_SERVER['HTTP_USER_AGENT'] : "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; 4399Box.560; .NET4.0C; .NET4.0E)";

        $data = http_build_query($post_data);
        $opts = [
            'http' => [
                'method' => $method,
                'header' =>
                    "Content-type: {$type[$content_type]}\r\n".
                    "User-Agent: {$ua}\r\n". //模拟UA
                    "Content-length: ".strlen($data)."\r\n" .
                    "Cookie: foo=bar\r\n" .
                    "\r\n",
                'content' => $data
            ]
        ];
        $cxContext = stream_context_create($opts);
        $sFile = file_get_contents($url, false, $cxContext);
    }

    return $sFile;
}