Zend Studio is the only Integrated Development Environment (IDE) designed for professional developers that encompasses all the development components necessary for the full PHP application lifecycle. Through a comprehensive set of editing, debugging, analysis, optimization, database tools and testing Zend Studio 5 speeds development cycles and simplifies complex projects.

Zend Studio comes in two editions: Zend Studio Professional and Zend Studio Standard. The Standard edition is designed for PHP beginners, and does not include remote debugging and profiling, database connectivity, CVS and FTP integration and more.

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• FAQ

Zend Studio Standard is available with a Perpetual (life-time) License. 
License also includes:

• One year subscription to Upgrades - includes all major, minor and bug fix version releases
• One year subscription to Support - includes unlimited support tickets to Zend Technical Support team

Edition Upgrades

If you purchased Zend Studio Standard but then realized you needed the additional features available in Zend Studio Professional, we will give you $50 credit towards your Zend Professional purchase. Pay only $249 for the full functionality of Zend Studio Professional any time after your original Zend Studio Standard purchase by clicking 'Upgrade' in your Pickup Depot.

Upgrade & Support Subscription

Be sure to renew your Upgrades and Support subscription annually to ensure access to all Upgrades and to the Zend Helpdesk for any technical issues you might encounter. Renewals can be purchased online through the Pickup Depot one month before your subscription is about to expire.

Renewal Before Upgrade & Support Subscription Expires: $99
Renewal After Upgrade & Support Subscription Expires: $99

Zend Studio also comes in a Professional Edition, which includes a comprehensive set of editing, debugging, analysis and optimization tools and is designed with business application development needs in mind.
Customers buying Zend Studio Professional get licenses for both the stand-alone Zend Studio Professional and the new Zend Studio for Eclipse – so you could enjoy both versions.