Web App Performance Testing with Siege: Plan, Test, Learn
PHP
By Zoran Antolovic,
Zoran uses Siege to benchmark and load-test a Symfony app, killing it in the process. He then uses cache to revive it and make it work under pressure!
stress test
Stress-test your PHP App with ApacheBench
PHP
By Bruno Skvorc,
Stress-test your app with ApacheBench - a tool designed to nuke your application with as many requests as you tell it to - see how strong your server is.