WordPress at a glance
filter is not described

post_limits filter-hook . WP 2.1.0

Filters the LIMIT clause of the query.

Usage

add_filter( 'post_limits', 'filter_function_name_3962', 10, 2 );
function filter_function_name_3962( $limits, $this ){
	// filter...

	return $limits;
}
$limits(string)
The LIMIT clause of the query.
$this(WP_Query)
The WP_Query instance (passed by reference).

Where the hook is called

WP_Query::get_posts()
wp-includes/class-wp-query.php 2559
$limits = apply_filters_ref_array( 'post_limits', array( $limits, &$this ) );

Where the hook is used (in WP core)

Does not used.