Check correct processing of the SQL statment with prepare(). Note that execute() requires a handle to the statement returned by prepare(), not the statment itself.
DB_ERROR_MISMATCH
NULL
Quantity of parameters didn't match quantity of placeholders in the prepared statment.
Check that the number of placeholders in the prepare() statement passed to $query equals the count of entries passed to $params.
Check the database related section of PHP-Manual to detect the reason for this error. In the most cases a misformed SQL statment. Ie. using LIMIT in a SQL-Statment for an Oracle database.
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