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[MySQL PDO Const]


Specifies that the parameter is an INOUT parameter for a stored procedure.

You must use it with one of PDO::PARAM_* family to typecast data type.

Here's mentioned PARAM_* family:


See example below for how it is done.

Used with:

  • PDOStatement::bindColumn
  • PDOStatement::bindParam
  • PDOStatement::bindValue
//$value_assigned_to_placeholder evaluates to integer, since in this example PARAM_INT was used.
$sth->bindValue(':named_paceholder', $value_assigned_to_placeholder, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT)