php man page for ob_get_level

OB_GET_LEVEL(3) 							 1							   OB_GET_LEVEL(3)

ob_get_level - Return the nesting level of the output buffering mechanism

SYNOPSIS
       int ob_get_level (void  )

DESCRIPTION
	Returns the nesting level of the output buffering mechanism.

RETURN VALUES
	Returns the level of nested output buffering handlers or zero if output buffering is not active.

SEE ALSO
       ob_start(3), ob_get_contents(3).

PHP Documentation Group 													   OB_GET_LEVEL(3)