Can I Reuse Named Placeholders in PDO Parameterized Queries?

Reusing Named Placeholders in PDO Parameterized Queries

PDO, a popular PHP extension, allows for the creation of parameterized SQL queries to prevent SQL injection vulnerabilities. In this context, a common question arises regarding the ability to reuse named placeholders in a statement.

Query with Multiple Placeholders

Suppose you have a SQL query where a specific value needs to be used multiple times. For instance:

SELECT :Param FROM Table WHERE Column = :Param

Reusing Placeholders

Intuitively, one might attempt to reuse the same named placeholder, ":Param," in both instances. However, as per the PDO::prepare documentation:

"You cannot use a named parameter marker of the same name twice in a prepared statement."

Conclusion

Therefore, it is not possible to reuse named placeholders with the same name in a PDO parameterized query. You would need to use distinct placeholder names for each occurrence of the value within the query.

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