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Editing: class-wp-filter-sentinel.php
<?php /** * Filter Sentinel API. * * @package WordPress * @since 7.1.0 */ declare( strict_types = 1 ); /** * Marker object used as a filter's default value when any user value — including * `null`, `false`, or arbitrary objects — must remain distinguishable from the * "no filter modified this" case. * * Each instance is unique by identity. Compare returned values with `===` against * the original sentinel to detect that no filter callback replaced it. * * Filter callbacks that want to pass through without modifying the value should * return the received value unchanged. Returning a freshly constructed * `WP_Filter_Sentinel` is treated as a replacement, not as pass-through. * * @since 7.1.0 */ final class WP_Filter_Sentinel {}
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