Error message

• Deprecated function: The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in include_once() (line 1374 of /home/tarc/public_html/includes/bootstrap.inc).
• Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in require_once() (line 341 of /home/tarc/public_html/includes/module.inc).
• Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in menu_set_active_trail() (line 2405 of /home/tarc/public_html/includes/menu.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home/tarc/public_html/includes/common.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/tarc/public_html/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/tarc/public_html/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Trying to access array offset on value of type null in calendar_plugin_row->render() (line 439 of /home/tarc/public_html/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
• Notice: Array to string conversion in bootstrap_item_list() (line 61 of /home/tarc/public_html/sites/all/themes/bootstrap/theme/system/item-list.func.php).
• Notice: Array to string conversion in bootstrap_item_list() (line 61 of /home/tarc/public_html/sites/all/themes/bootstrap/theme/system/item-list.func.php).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home/tarc/public_html/includes/common.inc).