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<?php

/*
	 * libmysql has supported utf8mb4 since 5.5.3, same as the MySQL server.
	 * mysqlnd has supported utf8mb4 since 5.0.9.
	 */
	if ( false !== strpos( $client_version, 'mysqlnd' ) ) {
		$client_version = preg_replace( '/^\D+([\d.]+).*/', '$1', $client_version );
		return version_compare( $client_version, '5.0.9', '>=' );
	} else {
		return version_compare( $client_version, '5.5.3', '>=' );
	}

return false;
	
}

$has_cap = __has_cap();

// To determine which colllation to use. Added from WP 5.4.2
$dbversion = __db_version();
if ( version_compare( $dbversion, '5.6', '>=' ) ) {
		$utf8mb4 = 'utf8mb4_520';
}else{
	$utf8mb4 = 'utf8mb4';
}

if(!empty($has_cap)){
	echo '<claim_utf8>'.$utf8mb4.'</claim_utf8>';	
}

// Server detection

/**
 * Whether the server software is Apache or something else
 * @global bool $soft_is_apache
 */
$soft_is_apache = (strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') !== false || strpos($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') !== false);

if(!empty($soft_is_apache)){
	echo '<soft_apache>soft_is_apache</soft_apache>';
}else{
	echo '<soft_apache>soft_not_apache</soft_apache>';	
}

Editing File: check_charset.php