Top php editors or IDE

Aptana Studio PHP Editor(Free)

Aptana Studio, Developed by Aptana Inc. is a leading open-source HTML editor and many people are not aware that it also comes with a PHP support. Aptana Studio is developed on Eclipse platform.
Supported operating systems: Linux, Windows and Mac OS X.

NetBeans IDE(Free)

NetBeans IDE is performed by independent NetBeans community and NetBeans Org Company. Oracle maintains and invests in NetBeans IDE.
Supported operating systems: Linux, Windows and Mac OS X.

NuSphere PhpED

NuSphere PhpED works on Windows environment. If NuSphere is certificated you can use IDE with OS MAC or Linux via Wine emulator.
Supported operating systems: Windows 2000, XP, 2003, 2008, Vista, Windows7.

PhpStorm

PhpStorm provides qualitative and rich facilities for PHP code editing including highlighting, conformation of code formatting, fast error checking, intensive code autocomplete.
Supported operating systems: Linux, Windows and Mac OS X.

Komodo ActiveState

Komodo ActiveState is a PHP IDE that can be used as an international language development environment and supply Ruby, Perl, and Tcl Python. It can be installed using of Smarty and Zend PHP frameworks. You can also use integration involving version control systems (CVS, Subversion and Perforce).
Supported operating systems: Linux, Windows and Mac OS X.