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PHP下载远程文件的三种方法以及性能考虑

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Jun 13, 2016 pm 12:28 PM

curlfilenbspresponsetest

PHP下载远程文件的3种方法以及性能考虑

今天在做导出Excel的时候，总是要测试导出的Excel文件，频繁的下载和打开，很麻烦

就想着写段代码一气呵成服务端导出Excel==>下载Excel文件到本地==>并打开的操作。

这里摘出PHP下载远端文件的方案，以备忘。其中第3种方法考虑到文件过大时的性能问题。

3种方案：

-rw-rw-r-- 1 liuyuan liuyuan 470 Feb 20 18:12 test1_fopen.php
-rw-rw-r-- 1 liuyuan liuyuan 541 Feb 20 18:06 test2_curl.php
-rw-rw-r-- 1 liuyuan liuyuan 547 Feb 20 18:12 test3_curl_better.php

方案1，适用于小文件

直接使用fopen()/file_get_contents()获取文件流并用file_put_contents()写入

<?php

//an example xls file form baidu wenku

$url =

'http://bs.baidu.com/wenku4/%2Fe43e6732eba84a316af36c5c67a7c6d6?sign=MBOT:y1jXjmMD4FchJHFHIGN4z:lfZAx1Nrf44aCyD6tJqJ2FhosLY%3D&time=1392893977&response-content-disposition=attachment;%20filename=%22php%BA%AF%CA%FD.xls%22&response-content-type=application%2foctet-stream'

;

$fp_input = fopen($url, 'r');

file_put_contents('./test.xls', $fp_input);

exec("libreoffice ./test.xls", $out, $status);

?>

方案2：通过Curl获取内容

<?php

//an example xls file form baidu wenku

$url =

'http://bs.baidu.com/wenku4/%2Fe43e6732eba84a316af36c5c67a7c6d6?sign=MBOT:y1jXjmMD4FchJHFHIGN4z:lfZAx1Nrf44aCyD6tJqJ2FhosLY%3D&time=1392893977&response-content-disposition=attachment;%20filename=%22php%BA%AF%CA%FD.xls%22&response-content-type=application%2foctet-stream'

;

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

file_put_contents('./test.xls', curl_exec($ch));

curl_close($ch);

exec("libreoffice ./test.xls", $out, $status);

?>

第1，2种方案存在一个问题，就是在写入本地磁盘之前，文件会被读入内存中，那么当文件很大的时候，可能会超出内存而崩溃

即使你的内存设置的足够的大，那这也是不别要的开销

解决方法是：直接给CURL一个可写的文件流来让它自己来解决这个问题（通过 CURLOPT_FILE选项），这样就要先创建一个文件指针给它。

<?php

//an example xls file form baidu wenku

$url =

'http://bs.baidu.com/wenku4/%2Fe43e6732eba84a316af36c5c67a7c6d6?sign=MBOT:y1jXjmMD4FchJHFHIGN4z:lfZAx1Nrf44aCyD6tJqJ2FhosLY%3D&time=1392893977&response-content-disposition=attachment;%20filename=%22php%BA%AF%CA%FD.xls%22&response-content-type=application%2foctet-stream'

;

$fp_output = fopen('./test.xls', 'w');

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_FILE, $fp_output);

curl_exec($ch);

curl_close($ch);

exec("libreoffice ./test.xls", $out, $status);

?>

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