# Affecting PHP's Behaviour

- APCu — APC User Cache
  - Installing/Configuring
  - Predefined Constants
  - APCu Functions
  - APCUIterator — The APCUIterator class
- Componere
  - Installing/Configuring
  - Componere\Abstract\Definition — The Componere\Abstract\Definition class
  - Componere\Definition — The Componere\Definition class
  - Componere\Patch — The Componere\Patch class
  - Componere\Method — The Componere\Method class
  - Componere\Value — The Componere\Value class
  - Componere Functions
- Error Handling — Error Handling and Logging
  - Installing/Configuring
  - Predefined Constants
  - Examples
  - Error Handling Functions
- FFI — Foreign Function Interface
  - Installing/Configuring
  - Examples
  - FFI — Main interface to C code and data
  - FFI\CData — C Data Handles
  - FFI\CType — C Type Handles
  - FFI\Exception — FFI Exceptions
  - FFI\ParserException — FFI Parser Exceptions
- OPcache
  - Installing/Configuring
  - Preloading
  - OPcache Functions
- Output Control — Output Buffering Control
  - Installing/Configuring
  - Predefined Constants
  - Output Buffering
  - Flushing System Buffers
  - User-Level Output Buffers
  - Examples
  - Output Control Functions
- PHP Options/Info — PHP Options and Information
  - Installing/Configuring
  - Predefined Constants
  - PHP Options/Info Functions
- phpdbg — Interactive PHP Debugger
  - Installing/Configuring
  - Predefined Constants
  - phpdbg Functions
- runkit7
  - Installing/Configuring
  - Predefined Constants
  - runkit7 Functions
- uopz — User Operations for Zend
  - Installing/Configuring
  - Predefined Constants
  - Uopz Functions
- WinCache — Windows Cache for PHP
  - Installing/Configuring
  - WinCache Functions
  - Building for Windows
- Xhprof — Hierarchical Profiler
  - Installing/Configuring
  - Predefined Constants
  - Examples
  - Xhprof Functions
- Yac
  - Installing/Configuring
  - Predefined Constants
  - Yac — The Yac class

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