MySQL backup

function _backup($params = array())
	{
		if (count($params) == 0)
		{
			return FALSE;
		}
 
		// Extract the prefs for simplicity
		extract($params);
 
		// Build the output
		$output = '';
		foreach ((array)$tables as $table)
		{
			// Is the table in the "ignore" list?
			if (in_array($table, (array)$ignore, TRUE))
			{
				continue;
			}
 
			// Get the table schema
			$query = $this->db->query("SHOW CREATE TABLE `".$this->db->database.'`.'.$table);
 
			// No result means the table name was invalid
			if ($query === FALSE)
			{
				continue;
			}
 
			// Write out the table schema
			$output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;
 
 			if ($add_drop == TRUE)
 			{
				$output .= 'DROP TABLE IF EXISTS '.$table.';'.$newline.$newline;
			}
 
			$i = 0;
			$result = $query->result_array();
			foreach ($result[0] as $val)
			{
				if ($i++ % 2)
				{ 					
					$output .= $val.';'.$newline.$newline;
				}
			}
 
			// If inserts are not needed we're done...
			if ($add_insert == FALSE)
			{
				continue;
			}
 
			// Grab all the data from the current table
			$query = $this->db->query("SELECT * FROM $table");
 
			if ($query->num_rows() == 0)
			{
				continue;
			}
 
			// Fetch the field names and determine if the field is an
			// integer type.  We use this info to decide whether to
			// surround the data with quotes or not
 
			$i = 0;
			$field_str = '';
			$is_int = array();
			while ($field = mysql_fetch_field($query->result_id))
			{
				// Most versions of MySQL store timestamp as a string
				$is_int[$i] = (in_array(
										strtolower(mysql_field_type($query->result_id, $i)),
										array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'), 
										TRUE)
										) ? TRUE : FALSE;
 
				// Create a string of field names
				$field_str .= $field->name.', ';
				$i++;
			}
 
			// Trim off the end comma
			$field_str = preg_replace( "/, $/" , "" , $field_str);
 
 
			// Build the insert string
			foreach ($query->result_array() as $row)
			{
				$val_str = '';
 
				$i = 0;
				foreach ($row as $v)
				{
					// Is the value NULL?
					if ($v === NULL)
					{
						$val_str .= 'NULL';
					}
					else
					{
						// Do a little formatting...
						$v = str_replace(array("\x00", "\x0a", "\x0d", "\x1a"), array('\0', '\n', '\r', '\Z'), $v);
						$v = str_replace(array("\n", "\r", "\t"), array('\n', '\r', '\t'), $v);
						$v = str_replace('\\', '\\\\',	$v);
						$v = str_replace('\'', '\\\'',	$v);
						$v = str_replace('\\\n', '\n',	$v);
						$v = str_replace('\\\r', '\r',	$v);
						$v = str_replace('\\\t', '\t',	$v);
 
						// Escape the data if it's not an integer
						if ($is_int[$i] == FALSE)
						{
							$val_str .= $this->db->escape($v);
						}
						else
						{
							$val_str .= $v;
						}					
					}					
 
					// Append a comma
					$val_str .= ', ';
					$i++;
				}
 
				// Remove the comma at the end of the string
				$val_str = preg_replace( "/, $/" , "" , $val_str);
 
				// Build the INSERT string
				$output .= 'INSERT INTO '.$table.' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
			}
 
			$output .= $newline.$newline;
		}
 
		return $output;
	}