How can I prevent SQL injection in PHP?

How can I prevent SQL injection in PHP?

If user input is inserted without modification into an SQL query, then the application becomes vulnerable to&nbsp;<a href="https://stackoverflow.com/a/332367/" target="_blank">SQL injection</a>, like in the following example:

If user input is inserted without modification into an SQL query, then the application becomes vulnerable to SQL injection, like in the following example:

$unsafe_variable = $_POST['user_input']; 

mysql_query("INSERT INTO table (column) VALUES ('$unsafe_variable')");

That's because the user can input something like value'); DROP TABLE table;--, and the query becomes:

INSERT INTO table (column) VALUES('value'); DROP TABLE table;--')

What can be done to prevent this from happening?

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