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The core method to prevent SQL injection is to use preprocessing statements and parameterized queries. 1. Use PDO preprocessing statements to bind user input through question marks or named parameters to ensure that the input is not executed as SQL code; 2. Use mysqli's preprocessing and bind_param method to clearly specify the parameter type to prevent malicious input from tampering with the SQL structure; 3. Avoid manually escape input, such as mysqli_real_escape_string, because it is prone to errors and insufficient security; 4. Use PHP built-in filter functions to verify input, such as filter_input and intval, to ensure the legality of the input data. These methods can effectively improve the security of PHP applications and prevent SQL
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