How do you write a secure database query in PHP to prevent SQL injection hacks?

Question

I am building a raw custom login backend framework. Why is concatenating user input strings directly into an SQL command line highly dangerous for database security?

DevExpert · Answer

Direct concatenation allows hackers to enter malicious SQL syntax inputs to bypass authentication. Always use PDO prepared statements with parameterized inputs to separate code logic from raw text data streams.

How do you write a secure database query in PHP to prevent SQL injection hacks?

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