siteurl-becomes-wp-error.php

<?php

define('DISABLE_WP_CRON', true);

require_once "wp-load.php";


add_filter("pre_get_table_charset", "fail_in_get_table_charset", 10);
/*
  simulate possible failure in
  https://github.com/WordPress/WordPress/blob/4.3.1/wp-includes/wp-db.php#L2306-L2308,
  but only when invoked from sanitize_option()
*/
function fail_in_get_table_charset()
{
    $trace = debug_backtrace();

    foreach ($trace as $call) {
        if ($call["function"] == "sanitize_option") {
            return new WP_Error( 'wpdb_get_table_charset_failure' );
        }
    }
    
    return null;
}

$opt = get_option("siteurl");
echo "- Original siteurl value: \n\n";
var_dump($opt);
echo "\n";

update_option("siteurl", $opt);
echo "- After updating with a failure in get_table_charset: \n\n";
var_dump(get_option("siteurl"));
echo "\n";

remove_filter("pre_get_table_charset", "fail_in_get_table_charset", 10);

// revert things back to allow for easy re-running
update_option("siteurl", $opt);
echo "- After updating with without failure in get_table_charset: \n\n";
var_dump(get_option("siteurl"));