gistfile1.txt

function julio_readable_duration( $entry, $with_zeros = 'all', $first_caps = false ) {
	// If we use the human_readable_duration format with ":"
	if ( ! is_numeric( $entry ) ) {
		// Create coefficients to get the real seconds count since 1970
		$coeff    = [ 1, MINUTE_IN_SECONDS, HOUR_IN_SECONDS, DAY_IN_SECONDS, MONTH_IN_SECONDS, YEAR_IN_SECONDS ];
		// we start from seconds to years and keep only integer values
		$data     = array_reverse( array_map( 'intval', explode( ':', $entry ) ) );
		// we reset the $entry param
		$entry    = 0;
		// Now for each of our data, we multiply using the next coeff at each iteration
		foreach ( $data as $index => $time ) {
			$entry += $time * $coeff[ $index ];
		}
		// Now we should have a number of second, or… you were using a text! -> notice and stop
		if ( ! $entry ) {
			trigger_error( 'Entry data must be numeric or respect format dd:hh:mm:ss' );
			return;
		}
	}
	// Transform the seconds into a full param string from seconds to years (max 999)
	$from   = new \DateTime( '@0' );
	$to     = new \DateTime( "@$entry" );
	$data   = explode( ':', $from->diff( $to )->format('%s:%i:%h:%d:%m:%y') );
	// This is where we will add our results to be returned
	$return = [];
	// Native labels from WP, yipikaye!
	$labels = [ _n_noop( '%s second', '%s seconds' ),
				_n_noop( '%s minute', '%s minutes' ),
				_n_noop( '%s hour', '%s hours' ),
				_n_noop( '%s day', '%s days' ),
				_n_noop( '%s month', '%s months' ),
				_n_noop( '%s year', '%s years' ),
	];
	// Now again for each value, we get the correct plural form
	foreach( $data as $i => $time ) {
		// We can display the zeros or not, ot just the last ones (see examples)
		if ( '0' === $time && ( 'none' === $with_zeros || ( 'last' === $with_zeros && ! empty( array_filter( $return, 'intval' ) ) ) ) ) {
			continue;
		}
		// The translated string
		$tmp      = sprintf( translate_nooped_plural( $labels[ $i ], $time ), $time );
		// We can get first letter of day in caps (like in english)
		if ( $first_caps ) {
			$tmp  = ucwords( $tmp );
		}
		// Add this in our results…
		$return[] = $tmp;
	}
	// … but we need it from years to seconds now
	$return = array_reverse( $return );
	// And use the magic wp_sprintf_l to get the ',' and ', and' !
	$text   = wp_sprintf( '%l', $return );

	return $text;
}