PHP implementation of Gunnar's 1 billion row challenge:

• https://www.morling.dev/blog/one-billion-row-challenge
• https://github.com/gunnarmorling/1brc

I wrote a blog post about the story that led to this version: Processing One Billion Rows in PHP!

make average
# or
php createMeasurements.php 1000000000
php -d extension=parallel calculateAverage.php > average.txt

This solutions requires a ZTS build of PHP and ext-parallel to be installed for that PHP version.