[PHP知识库]php 下载大文件的处理方案

场景

1. 客户的支付宝账单压缩包85MB, 加上进程其他的消耗 超过了php默认128MB的限制，导致下载失败

分析

目前方案使用curl请求文件地址, 将文件数据放入变量，然后通过fwrite写入磁盘; 变量太大超过了内存限制
所以需要考虑直接写入硬盘

function alipayCurl($sid, $url, $filePath)
{

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    $content = curl_exec($ch);
    $errno = curl_errno($ch);

    if ($errno) {
        logx("alipay_query start down fail curl_errno" . print_r($errno, true), $sid);
         curl_close($ch);
        return false;
    } else {
        $httpStatusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if (200 !== $httpStatusCode) {
            logx("alipay_query start down fail curl_getinfo" . print_r($httpStatusCode, true), $sid);
             curl_close($ch);
            return false;
        }
    }

    curl_close($ch);
	$resource = fopen($filePath, 'w');
    fwrite($resource, $content);
    fclose($resource);
	
	return true;
}

解决

// 直接写入硬盘
function alipayCurlNew($sid, $url, $filePath)
{
    //初始化
    $curl = curl_init();
    //设置抓取的url
    curl_setopt($curl, CURLOPT_URL, $url);
    //打开文件描述符
    $fp = fopen ($filePath, 'w+');
    curl_setopt($curl, CURLOPT_FILE, $fp);
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($curl,CURLOPT_TIMEOUT,50);

    curl_exec($curl);
    if (curl_errno($curl)) {
        $message = curl_error($curl);
        logx("下载账单文件失败" . $message , $sid);
        curl_close($curl);
        return false;
    }

    //关闭URL请求
    curl_close($curl);
    //关闭文件描述符
    fclose($fp);

    return true;
}