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The Liskov Substitution Principle

By nisha_singh via phpmaster.com
Submitted On January 25, 2012

Morpheus: Neo, I’m inside the Matrix right now. Sorry to give you the bad news but our agent-tracking PHP program needs a quick update. It currently uses PDO’s query() method with strings to fetch the status of all the Matrix agents from our database, but we need to do that with prepared queries instead.

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