PHP read CSV large file Import Database

Source: Internet
Author: User
Tags import database
How does PHP read the CSV large file and import the database?

For millions of data volumes of CSV file, the file size may reach hundreds of m, if simply read, it is likely to have a time-out or a card-dead phenomenon.

Batch processing is necessary in order to successfully import data from a CSV file into a database.

The following function reads a few rows of data specified in a CSV file:

/** * Csv_get_lines reads a few rows of data in the CSV file * @param $csvfile CSV file path * @param $lines Read rows * @param $offset starting lines * @return Array * */function Csv_get_lines ($csvfile, $lines, $offset = 0) {if (! $fp = fopen ($csvfile, ' R ')) {return false;} $i = $j = 0; while (false!== ($line = fgets ($fp))) {if ($i + + < $offset) {continue;} break;} $data = Array (); while ($j + + < $lines) &&!feof ($fp)) {$data [] = Fgetcsv ($FP);} fclose ($FP); return $data; }
Call Method:



$data = Csv_get_lines (' path/bigfile.csv ', 10, 2000000);

Print_r ($data);

The function mainly adopts the idea of line positioning, and the file pointer positioning is achieved by skipping the number of start lines.

As for how data is put into storage, this article is no longer detailed.

The above function tests the files within 500M, runs smoothly, and does not test for larger files, please use them or improve them.
  • Related Article

    Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.