Various fixes to improve PHP 8.0 compatibility

- XmlParser 클래스가 PHP 내장 클래스가 되어버려서 XeXmlParser로 변경
- 함수나 파라미터의 형태가 맞지 않아서 치명적인 오류 나는 곳 수정
- undefined 변수 및 배열 키 다수 수정 (치명적인 오류는 아님)
- 계속 수정중...

common/framework/db.php

@@ -836,6 +836,10 @@ class DB
 			$dbtype = $matches[1];
 			$size = $matches[2];
 		}
+		else
+		{
+			$size = '';
+		}
 		$xetype = Parsers\DBTableParser::getXEType($dbtype, $size ?: '');
 		
 		// Return the result as an object.

common/framework/parsers/dbquery/query.php

@@ -528,6 +528,8 @@ class Query extends VariableBase
 		{
 			return '';
 		}
+		$page = 0;
+		$offset = 0;
 		
 		// Get the offset from the page or offset variable.
 		if ($navigation->page)

common/framework/parsers/dbquery/variablebase.php

@@ -39,7 +39,7 @@ class VariableBase
 			$value = '(' . $this->getQueryString($prefix, $args) . ')';
 			$params = $this->getQueryParams();
 		}
-		elseif ($this->var && Query::isValidVariable($args[$this->var], $this instanceof ColumnWrite))
+		elseif ($this->var && Query::isValidVariable($args[$this->var] ?? null, $this instanceof ColumnWrite))
 		{
 			if ($args[$this->var] instanceof EmptyString || $args[$this->var] instanceof NullValue)
 			{
@@ -285,7 +285,7 @@ class VariableBase
 	 */
 	public function getValue(array $args)
 	{
-		if ($this->var && Query::isValidVariable($args[$this->var], $this instanceof ColumnWrite))
+		if ($this->var && Query::isValidVariable($args[$this->var] ?? null, $this instanceof ColumnWrite))
 		{
 			if ($args[$this->var] === '')
 			{
@@ -321,7 +321,7 @@ class VariableBase
 	public function getDefaultValue()
 	{
 		// Get the current column name.
-		$column = $this instanceof ColumnWrite ? $this->name : $this->column;
+		$column = $this instanceof ColumnWrite ? $this->name : ($this->column ?? null);
 		
 		// If the default value is a column name, escape it.
 		if (strpos($this->default, '.') !== false && Query::isValidColumnName($this->default))
@@ -382,7 +382,7 @@ class VariableBase
 		// Don't apply a filter if there is no variable.
 		$column = $this instanceof ColumnWrite ? $this->name : $this->column;
 		$filter = isset($this->filter) ? $this->filter : '';
-		if (strval($value) === '')
+		if (!is_array($value) && strval($value) === '')
 		{
 			$filter = '';
 		}

common/framework/router.php

@@ -146,7 +146,8 @@ class Router
 			$prefix_type = 'mid';
 			
 			// Find the module associated with this prefix.
-			$action_info = self::_getActionInfoByPrefix($prefix, $module_name = '');
+			$module_name = '';
+			$action_info = self::_getActionInfoByPrefix($prefix, $module_name);
 			if ($action_info === false)
 			{
 				$action_info = self::_getActionInfoByModule($prefix);

common/framework/session.php

@@ -963,7 +963,7 @@ class Session
 	public static function getValidityInfo($member_srl)
 	{
 		$member_srl = intval($member_srl);
-		$validity_info = Cache::get(sprintf('session:validity_info:%d', $member_srl), $invalid_before);
+		$validity_info = Cache::get(sprintf('session:validity_info:%d', $member_srl));
 		if ($validity_info)
 		{
 			return $validity_info;