PHP獲取遠程附件的一種方法

    protected function sendRequest($url, $data, $refer = "", $timeout = 10, $header = [])
    {
        $curlObj = curl_init();
        $ssl = stripos($url,'https://') === 0 ? true : false;
        $options = [
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_FOLLOWLOCATION => 1,
            CURLOPT_AUTOREFERER => 1,
            CURLOPT_TIMEOUT => $timeout,
            CURLOPT_REFERER => $refer
        ];
        if (!empty($header)) {
            $options[CURLOPT_HTTPHEADER] = $header;
        }
        if ($refer) {
            $options[CURLOPT_REFERER] = $refer;
        }
        if ($data) {
            $options[CURLOPT_POST] = 1;
            $options[CURLOPT_POSTFIELDS] = $data;
        }
        if ($ssl) {
            $options[CURLOPT_SSL_VERIFYHOST] = false;
            $options[CURLOPT_SSL_VERIFYPEER] = false;
        }
        curl_setopt_array($curlObj, $options);
        $returnData = curl_exec($curlObj);
        if (curl_errno($curlObj)) {
            $returnData = curl_error($curlObj);
        }
        curl_close($curlObj);
        return $returnData;
    }

    /**
     * 獲取遠程文件
     * @param $url
     * @param string $save_dir
     * @param string $filename
     * @param int $type
     * @return array|bool
     */
    public function getFile($url, $save_dir = '', $filename = '', $type = 0)
    {
        if (trim($url) == '') {
            return false;
        }
        if (trim($save_dir) == '') {
            $save_dir = '/tmp/';
        }
        //創建保存目錄
//        if (!file_exists($save_dir) && !mkdir($save_dir, 0777, true)) {
//            return false;
//        }
        //獲取遠程文件所採用的方法
        if ($type) {
            $content = $this->sendRequest($url);
        } else {
            ob_start();
            readfile($url);
            $content = ob_get_contents();
            ob_end_clean();
        }
        $size = strlen($content);
        //文件大小
        $fp2 = @fopen($save_dir . $filename, 'a');
        fwrite($fp2, $content);
        fclose($fp2);
        unset($content, $url);
        return array(
            'file_name' => $filename,
            'save_path' => $save_dir . $filename
        );
    }