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Validate and Escape Data to Prevent SQL Injection

sql-injectionSo we’re back on the topic of SQL Injection, and how to prevent them with PHP. This subject, while often discussed, is not taken as seriously as it should be by many a web-developer, whether it be because of laziness, or merely due to lack of knowledge. Assuming the latter is the most common cause, I felt that I should elaborate a little more on my previous article on the topic.
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Preventing SQL Injection with PHP

sql injectionSQL Injection. We’ve all heard the term. But what exactly is it? Sounds dirty and vile… or maybe something you get at the doctor’s office. A new type of plastic surgery maybe? Well, let’s find out, shall we?

From Wikiedpia.com:

SQL injection is a technique that exploits a security vulnerability occurring in the database layer of an application. The vulnerability is present when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and thereby unexpectedly executed. It is in fact an instance of a more general class of vulnerabilities that can occur whenever one programming or scripting language is embedded inside another.

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