overload
Introduction
Affecting PHP's Behaviour
PHP Manual

# Output Buffering Control

- Introduction
- Installing/Configuring
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Examples
- Output Control Functions
  - flush — Flush the output buffer
  - ob_clean — Clean (erase) the output buffer
  - ob_end_clean — Clean (erase) the output buffer and turn off output buffering
  - ob_end_flush — Flush (send) the output buffer and turn off output buffering
  - ob_flush — Flush (send) the output buffer
  - ob_get_clean — Get current buffer contents and delete current output buffer
  - ob_get_contents — Return the contents of the output buffer
  - ob_get_flush — Flush the output buffer, return it as a string and turn off output buffering
  - ob_get_length — Return the length of the output buffer
  - ob_get_level — Return the nesting level of the output buffering mechanism
  - ob_get_status — Get status of output buffers
  - ob_gzhandler — ob_start callback function to gzip output buffer
  - ob_implicit_flush — Turn implicit flush on/off
  - ob_list_handlers — List all output handlers in use
  - ob_start — Turn on output buffering
  - output_add_rewrite_var — Add URL rewriter values
  - output_reset_rewrite_vars — Reset URL rewriter values

overload
Introduction
Affecting PHP's Behaviour
PHP Manual