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When you execute a SQL query, you have to clean your strings or users can execute malicious SQL on your website.
I usually just have a function escape_string(blah), which:
\) with double escapes (\\).') with an escaped single quote (\'). Is this adequate? Is there a hole in my code? Is there a library which can do this quickly and reliably for me?
I’d like to see graceful solutions in Perl, Java, and PHP.
For maximum security, performance, and correctness use prepared statements. Here’s how to do this with lots of examples in different languages, including PHP:
https://stackoverflow.com/questions/1973/what-is-the-best-way-to-avoid-sql-injection-attacks