I'm currently using PhpStorm by
Idea JetBrains, but its buggy and I'm really looking for something that will allow me to get work done without too much hassle.
Please limit one IDE/Editor an answer.
Netbeans is a great IDE with lots of PHP support. I can't even start to name all the features I use but there are a fair amount. Check it out here:
I've used both Eclipse for Java and Netbeans for PHP and I feel Netbeans is a bit stronger for PHP as well as XHTML and CSS. That's my personal preference anyways.
Looking at PHPStorm I assume you're looking for something similar to it, so a full IDE. Netbeans and Eclipse are the closest to that as far as I'm familiar with.
Netbeans has most, if not all, the features that PhpStorm has on that page plus a whole lot more.
This is an advanced editor/lightweight IDE with lots of features. Like Gedit, it has syntax highlighting for PHP and is extendible through plugins. It has some more advanced features than Gedit such as code folding. It can be installed from the repositories by installing the package
geany and optionally
Well, you have to work a little at the start to make it an IDE but it's great once you do it. It has GUI version called GVim as well. Install it with
sudo apt-get install vim-gtk
This is another good editor that supports PHP and is more web-focused than Gedit or Geany so may be more suitable for PHP. You can install it from the package
I suggest using the Eclipse PHP development tools
You can use the same IDE on all systems and in addition to the simple features of a text editor you get all the additional stuff that you need for larger projects: context aware code completion, refactoring, integration of versioning systems, issue tracking, deployment to remote servers and much other stuff.
Komodo is (imho) better but is a bit too weighty, especially with big files that reference many other files (in your file includes another one, Komodo scan it to get the function/classes it contains and offer them in the auto-completition function).
For big files I use geany; it's really fast and complete.
Quanta Plus is part of the kde web development package and is a good solution for KDE users.
I use Eclipse with Aptana
After having installed Aptana you can add some additional plugin, as php development tools, subclipse etc.