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PUM_Utils_Array::move_item( array $ref_arr, string $key1, int|string $move, string|null $key2 = null )

	public static function move_item( &$ref_arr, $key1, $move, $key2 = null ) {
		$arr = $ref_arr;

		if ( $key2 == null ) {
			$key2 = $key1;
		}

		if ( ! isset( $arr[ $key1 ] ) || ! isset( $arr[ $key2 ] ) ) {
			return false;
		}

		$i = 0;
		foreach ( $arr as &$val ) {
			$val = [
				'sort' => ( ++ $i * 10 ),
				'val'  => $val,
			];
		}

		// Add a quick keyword `swap` to make syntax simpler to remember.
		if ( 'swap' === $move ) {
			$move = 0;
		}

		if ( is_numeric( $move ) ) {
			if ( $move == 0 && $key1 == $key2 ) {
				return true;
			} elseif ( $move == 0 ) {
				$tmp                  = $arr[ $key1 ]['sort'];
				$arr[ $key1 ]['sort'] = $arr[ $key2 ]['sort'];
				$arr[ $key2 ]['sort'] = $tmp;
			} else {
				$arr[ $key1 ]['sort'] = $arr[ $key2 ]['sort'] + ( $move * 10 + ( $key1 == $key2 ? ( $move < 0 ? - 5 : 5 ) : 0 ) );
			}
		} else {
			switch ( $move ) {
				case 'up':
				case 'before':
					$arr[ $key1 ]['sort'] = $arr[ $key2 ]['sort'] - ( $key1 == $key2 ? 15 : 5 );
					break;
				case 'down':
				case 'after':
					$arr[ $key1 ]['sort'] = $arr[ $key2 ]['sort'] + ( $key1 == $key2 ? 15 : 5 );
					break;
				case 'top':
					$arr[ $key1 ]['sort'] = 5;
					break;
				case 'bottom':
					$arr[ $key1 ]['sort'] = $i * 10 + 5;
					break;
				default:
					return false;
			}
		}

		uasort( $arr, [ __CLASS__, 'sort_by_sort' ] );

		foreach ( $arr as &$val ) {
			$val = $val['val'];
		}

		$ref_arr = $arr;

		return true;
	}