Escapes the given string to protect against SQL injection attacks. By default it assumes that backslashes are not supported as they are not part of the standard SQL spec. Quoting from the SQLlite web ...

is there a functional difference between addslashes() and mysqli_real_escape_string() or are they equally effective? i ask this because mysqli_real_escape_string() always returns a blank string. i ...

pg_escape_string method to sanitize user input into a safe form. pg_escape_string internally calls PQescapeStringInternal, which actually performs the escaping process, and PQescapeStringInternal ...