PHPUnit is a testing framework. You can create test classes, run and see the code coverage directly from IDE interface.

NetBeans provides code completion and documentation for all Twig elements.

You can run Linux terminal inside the IDE.

Supports synchronization with projects stored remotely through FTP or SFTP.

Has built-in support for the most popular revision control systems

NetBeans can be extended beyond the basic tool that you get out of the box through community made custom plugins.

Supports documentation generation through ApiGen and PHPDoc.

Supports Symfony1, Symfony2 & Zend frameworks.

NetBeans is a free, GPL-licensed IDE. It can can run on any computer with a Java virtual machine. If a computer has a Java virtual machine (JVM), Netbeans can run on it. Netbeans can therefore run on a variety of operating systems such as Windows, *nix, and Mac OS.

The most used composer commands can be done directly from IDE.

ApiGen allows automatically generating documentation from specifically formatted comments. It's easy to use, supports traits, allows fuzzy searching for classes and highlighting docblocks using Markdown.

NetBeans is a free, GPL-licensed IDE. It can can run on any computer with a Java virtual machine. If a computer has a Java virtual machine (JVM), Netbeans can run on it. Netbeans can therefore run on a variety of operating systems such as Windows, *nix, and Mac OS. Being open source means that developers can contribute changes to the code to have the IDE better serve them.

Netbeans not only debugs your code, and points out errors but also gives you hints on which sections of your code could be further optimized.