TypeError Object
(
    [message:protected] => Unsupported operand types: string - string
    [string:Error:private] => 
    [code:protected] => 0
    [file:protected] => /var/www/html/website/view/pages/site-pictures.php
    [line:protected] => 20
    [trace:Error:private] => Array
        (
            [0] => Array
                (
                    [file] => /var/www/html/website/incl/initia.php
                    [line] => 555
                    [function] => {closure}
                )

            [1] => Array
                (
                    [file] => /var/www/html/website/incl/initia.php
                    [line] => 570
                    [function] => mergeSort
                )

            [2] => Array
                (
                    [file] => /var/www/html/website/incl/initia.php
                    [line] => 545
                    [function] => mergeSort
                )

            [3] => Array
                (
                    [file] => /var/www/html/website/view/pages/site-pictures.php
                    [line] => 23
                    [function] => comparisonSort
                )

            [4] => Array
                (
                    [file] => /var/www/html/website/view/pages/information.php
                    [line] => 48
                    [args] => Array
                        (
                            [0] => /var/www/html/website/view/pages/site-pictures.php
                        )

                    [function] => require_once
                )

            [5] => Array
                (
                    [file] => /var/www/html/website/view/index.php
                    [line] => 6
                    [args] => Array
                        (
                            [0] => /var/www/html/website/view/pages/information.php
                        )

                    [function] => require_once
                )

            [6] => Array
                (
                    [file] => /var/www/html/website/index.php
                    [line] => 84
                    [args] => Array
                        (
                            [0] => /var/www/html/website/view/index.php
                        )

                    [function] => require_once
                )

        )

    [previous:Error:private] => 
)