Error in bugfree login, php error

Error in bugfree login, php error. Help HPErrormysql_escape_string (): Thisfunctionisdeprecated; usemysql_real_escape_string () instead. & nb bugfree logon error, php error. Help
HP Error
Mysql_escape_string (): This function is deprecated; use mysql_real_escape_string () instead.

C: \ xampp \ htdocs \ bugfree \ protected \ service \ SqlService. php (563)

551 *
552 * @ author Yupeng Lee
553 * @ param string $ fieldName FieldName
554 * @ param string $ operatorName =, <,>, <= eg.
555 * @ param string $ fieldValue FieldValue
556 * @ return string Query string for SQL
557 */
558 private static function baseGetFieldQueryStr ($ searchFieldConfig, $ type, $ fieldName, $ operatorName, $ fieldValue)
559 {
560 $ basicTableName = '{{'. $ type. 'View }}';
561 $ fieldValue = trim ($ fieldValue );
562
563 $ fieldValue = mysql_escape_string ($ fieldValue );
564 // handle search value %
565 $ fieldValue = str_replace ('%', '\ %', $ fieldValue );
566 // $ fieldValue = str_replace ('_', '\ _', $ fieldValue );
567
568 $ queryStr = '';
569 if ($ fieldValue = '')
570 {
571 return $ queryStr;
572}
573 elseif (Info: MARK = $ fieldName)
574 {
575 $ inOrNotIn = 'not in ';
Stack Trace
#0 +-C: \ xampp \ htdocs \ bugfree \ protected \ service \ SqlService. php (563): mysql_escape_string ("Sample Product ")
558 private static function baseGetFieldQueryStr ($ searchFieldConfig, $ type, $ fieldName, $ operatorName, $ fieldValue)
559 {
560 $ basicTableName = '{{'. $ type. 'View }}';
561 $ fieldValue = trim ($ fieldValue );

------ Solution --------------------
Mysql_escape_string (): This function is deprecated; use mysql_real_escape_string () instead
The mysql_escape_string () function is obsolete and replaced by mysql_real_escape_string ().