Alternative to mysql_real_escape_string without connecting to DB

Question

I'd like to have a function behaving as mysql_real_escape_string without connecting to database as at times I need to do dry testing without DB connection. mysql_escape_string is deprecated and therefore is undesirable. Some of my findings:

http://www.gamedev.net/community/forums/topic.asp?topic_id=448909

http://w3schools.invisionzone.com/index.php?showtopic=20064

Answer 1

It is impossible to safely escape a string without a DB connection. mysql_real_escape_string() and prepared statements need a connection to the database so that they can escape the string using the appropriate character set - otherwise SQL injection attacks are still possible using multi-byte characters.

If you are only testing, then you may as well use mysql_escape_string(), it's not 100% guaranteed against SQL injection attacks, but it's impossible to build anything safer without a DB connection.

Answer 2

Well, according to the mysql_real_escape_string function reference page: "mysql_real_escape_string() calls MySQL's library function mysql_real_escape_string, which escapes the following characters: \x00, \n, \r, \, ', " and \x1a."

With that in mind, then the function given in the second link you posted should do exactly what you need:

function mres($value) {     $search = array("\\",  "\x00", "\n",  "\r",  "'",  '"', "\x1a");     $replace = array("\\\\","\\0","\\n", "\\r", "\'", '\"', "\\Z");      return str_replace($search, $replace, $value); }