(PHP 4 >= 4.2.0, PHP 5, PHP 7)
ob_get_level — Return the nesting level of the output buffering mechanism
ob_get_level ( ) : int
Returns the nesting level of the output buffering mechanism.
Returns the level of nested output buffering handlers or zero if output buffering is not active.
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https://www.php.net/manual/en/function.ob-get-level.php