PhpStorm by JetBrains - The Smartest PHP IDE

The IDE that actually GETS your code. Supports PHP 5.3 & 5.4, modern and legacy projects. On the fly error prevention. Best autocompletion & Code Refactoring. Zero configuration debugging. Best JavaScript support included. Frequent updates. More information about PhpStorm.
 
 
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Zero-configuration Debugging
Xdebug Installation Guide
Zend Debugger Installation Guide
Configure Zend Debugger Toolbar for Firefox to work with PhpStorm