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The Debug component provides tools to ease debugging PHP code.
The ErrorHandler component provides tools to manage errors and ease debugging PHP code.
The DebugBundle allows greater integration of the VarDumper component in the Symfony full-stack framework.
Debugging tools: Symfony VarDumper and Chrome Logger in one package
A PHP application visualization/debugging tool for ZendFramework/Symfony
A simple Symfony 1.4 plugin to make responding to JSON requests and debugging easier.