How Can I Safely Use LIKE '%{$var}%' with Prepared Statements?

Correct Usage of LIKE '%{$var}%' with Prepared Statements

Secure and efficient database queries require the proper usage of prepared statements, especially when incorporating dynamic values like '%{$var}%' into LIKE clauses. This article demonstrates the correct approach to employ LIKE with prepared statements.

The incorrect syntax provided in the question results in errors because it contains placeholders that aren't recognized by the prepared statement. To rectify this, it's necessary to:

1. Enclose the dynamic value '%{$var}%' in a string concatenation to create a specific LIKE condition: $likeVar = "%" . $yourParam . "%";
2. Prepare the query using the ? placeholder, excluding the LIKE conditions: $stmt = $mysqli->prepare("SELECT * FROM REGISTRY where name LIKE ?");
3. Bind the prepared LIKE condition using bind_param: $stmt->bind_param("s", $likeVar);

By following these steps, you can effectively utilize LIKE with prepared statements, improving both the security and performance of your database queries.

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