处理长度为3000万个字符的字符串

问题描述

我正在从另一台服务器下载CSV文件，作为来自供应商的数据提要.

I am downloading a CSV file from another server as a data feed from a vendor.

我正在使用curl获取文件的内容，并将其保存到名为$contents的变量中.

I am using curl to get the contents of the file and saving that into a variable called $contents.

我可以很好地做到这一点，但是我尝试通过\r和\n爆炸以获取行的数组，但是失败并出现内存不足"错误.

I can get to that part just fine, but I tried exploding by \r and \n to get an array of lines but it fails with an 'out of memory' error.

我echo strlen($contents)大约是3050万个字符.

I echo strlen($contents) and it's about 30.5 million chars.

我需要操纵这些值并将它们插入数据库中.为了避免内存分配错误，我该怎么办?

I need to manipulate the values and insert them into a database. What do I need to do to avoid memory allocation errors?

推荐答案

PHP令人窒息，因为它耗尽了内存.

PHP is choking because it's running out memory. Instead of having curl populate a PHP variable with the contents of the file, use the

CURLOPT_FILE

将文件保存到磁盘的选项.

option to save the file to disk instead.

//pseudo, untested code to give you the idea

$fp = fopen('path/to/save/file', 'w');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_exec ($ch);
curl_close ($ch);
fclose($fp);

然后，一旦文件被保存，而不是使用file或file_get_contents函数(会将整个文件加载到内存中，再次杀死PHP)，请使用fopen和 fgets 一次读取一行文件.

Then, once the file is saved, instead of using the file or file_get_contents functions (which would load the entire file into memory, killing PHP again), use fopen and fgets to read the file one line at a time.

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