(DO NOT document this function yet)

Fixed crash bug with ob_end_*() function. ob_end_*() will not delete
buffers that may not be deleted.

php_start_ob_buffer() and php_ob_set_internal_handler() takes parameter for
if the buffer created may be deleted or not.

Added 3rd parameter "bool erase" to ob_start(). If FALSE, buffer may not be
deleted until script finshes.

Changed ob_*() function that have void return type to bool. All ob_*()
functions return TRUE for success, FALSE for failure.

@ - Added ob_get_status() to get array of buffers and it's status. (Yasuo)
@ - Fixed crash bug with ob_end_*() function. ob_end_*() will not delete
@   buffers that may not be deleted. (Yasuo)
@ - Added 3rd parameter "bool erase" to ob_start(). If FALSE, buffer may not be
@   deleted until script finshes. (Yasuo)
@ - Changed ob_*() function that have void return type to bool. All ob_*()
@   functions return TRUE for success, FALSE for failure. (Yasuo)

  mechanism. (patch by Yasuo Ohgaki <yasuo_ohgaki@yahoo.com>)
@- Added ob_get_level, which returns the nesting level of the output buffering
@  mechanism. (Yasuo, Derick)

  ob_end_flush and ob_end_clean do.
@- Added ob_flush and ob_clean functions, which flush and clean an
@  output buffer without destroying the buffer. (Derick)

'officially' disabled during shutdown (this doesn't change the Apache module
behavior, but may change behavior of other server modules, in which it was
possible to emit output during shutdown;  I think it's a good step towards
consistency, though)