CTasksTools::SanitizeHtmlDescriptionIfNeed

static function SanitizeHtmlDescriptionIfNeed($rawHtml)
{
	static $bUseHtmlSanitizer = null;
	static $oSanitizer = null;

	// Init sanitizer (if we need it) only once at hit
	if ($bUseHtmlSanitizer === null)
	{
		$bSanitizeLevel = COption::GetOptionString('tasks', 'sanitize_level');

		if ($bSanitizeLevel >= 0)
		{
			$bUseHtmlSanitizer = true;

			if ( !
				in_array(
					$bSanitizeLevel,
					array(
						CBXSanitizer::SECURE_LEVEL_HIGH,
						CBXSanitizer::SECURE_LEVEL_MIDDLE,
						CBXSanitizer::SECURE_LEVEL_LOW
					)
				)
			)
			{
				$bSanitizeLevel = CBXSanitizer::SECURE_LEVEL_HIGH;
			}

			$oSanitizer = new CBXSanitizer();
			$oSanitizer->SetLevel($bSanitizeLevel);
			$oSanitizer->AddTags(
				array(
					'blockquote' => array('style', 'class', 'id'),
					'colgroup'   => array('style', 'class', 'id'),
					'col'        => array('style', 'class', 'id', 'width', 'height', 'span', 'style')
				)
			);
			$oSanitizer->ApplyHtmlSpecChars(true);

			// if we don't disable this, than text such as "df 1 < 2 dasfa and 5 > 4 will be partially lost"
			$oSanitizer->DeleteSanitizedTags(false);
		}
		else
			$bUseHtmlSanitizer = false;
	}

	if ( ! $bUseHtmlSanitizer )
		return ($rawHtml);

	return ($oSanitizer->SanitizeHtml(htmlspecialcharsback($rawHtml)));
}