functions.php

<?php
/**
 * Global functions.
 *
 * @package Functions
 * @author  Pierre Lannoy <https://pierre.lannoy.fr/>.
 * @since   3.4.1
 */

/**
 * Verify if a timestamp is a TRUE unix timestamp or based on monotonic clock.
 * If it's based on monotonic clock, fix it.
 *
 * Patch done for supporting APCu > 5.1.21
 * @see https://stackoverflow.com/questions/74227993/php-apcu-monotonic-ttl-clock-change-please-confirm-my-understanding-of-timesta
 *
 * @since 3.4.1
 *
 * @param integer $value  A timestamp.
 * @return integer A true unix timestamp.
 */
function apcm_unix_ts( $value ) {
	if ( $value > 946681201 ) {
		return $value;
	}
	$time = time();
	if ( ! function_exists( 'hrtime' ) ) {
		return $time;
	}
	$hr = hrtime();
	if ( ! is_array( $hr ) ) {
		return $time;
	}
	$hrtime = (int) $hr[0];
	if ( $hrtime < $value ) {
		return $time;
	}
	return $time - $hrtime + $value;
}