On the SmartTutorials.com site there's an article posted showing how to install CakePHP 3 with Composer, the popular PHP package management tool.

Installation of CakePHP 3 somewhat tricky/difficult for newbies. I will give you step by step instructions to install CakePHP 3 on your machine successfully, All you need to do is just follow this tutorial.

There's a brief section about requirements needed for the system you're installing it onto. Then they break the process up into a few different steps:

• Installing Composer if you haven't already
• Install CakePHP 3 using Composer
• Setting permissions for the temporary (tmp) directory

While their platform choice for the tutorial is Windows, the instructions mostly apply for linux-based systems. There's a few screenshots sprinkled in to show you what things should look like as you go along.