:sig
void ob_start()

:params
(none)

:see
>ob

:content
Starts a new output buffer.

All subsequent output is directed into that buffer until it is closed or collected. Every call to `ob_start()` pushes another buffer onto the output buffer stack. `ob_close()` and `ob_get_close()` destroy buffers and remove them from the stack.

Related:

- PHP: `ob_start()`, `ob_get_contents()`, `ob_get_clean()`, and related output-buffering APIs
- JavaScript / Node.js: string accumulation, buffer capture, or render-to-string patterns in server code