CLI:

php -d memory_limit=512M run.php config_file.ini

Web:

Put project files and index.php to your web server directory. Then access it from a web browser.

CLI:

• Memory limit must be set to 512M

Web:

• Memory limit must be set to 512M
• Script must be able to set 0 as time limit.
• Zip PECL Library needed for ZIP packaging of result files.

FFT class from http://www.phpclasses.org/package/6193-PHP-Compute-the-Fast-Fourier-Transform-of-sampled-data.html

i2500k CPU, Mac OS X Yosemite, php 5.6 script executes for ~2,5 minutes
i2500k CPU, Mac OS X Yosemite, php 7 (currently in development) script executes for ~1 minute