PDOSTATEMENT.BINDPARAM(3)						 1						 PDOSTATEMENT.BINDPARAM(3)

PDOStatement::bindParam - Binds a parameter to the specified variable name

SYNOPSIS

       public  bool  PDOStatement::bindParam  (mixed   $parameter,  mixed   &$variable, [int  $data_type = PDO::PARAM_STR], [int  $length], [mixed
       $driver_options])

DESCRIPTION

	Binds a PHP variable to a corresponding named or question mark placeholder in the SQL statement that was used to  prepare  the	statement.
       Unlike  PDOStatement.bindValue(3), the variable is bound as a reference and will only be evaluated at the time that PDOStatement.execute(3)
       is called.

	Most parameters are input parameters, that is, parameters that are used in a read-only fashion to build up the query. Some drivers support
       the  invocation of stored procedures that return data as output parameters, and some also as input/output parameters that both send in data
       and are updated to receive it.

PARAMETERS

	      o $parameter
		- Parameter identifier. For a prepared statement using named placeholders, this will be a parameter name of the form $:name. For a
		prepared statement using question mark placeholders, this will be the 1-indexed position of the parameter.

	      o $variable
		- Name of the PHP variable to bind to the SQL statement parameter.

	      o $data_type
		- Explicit data type for the parameter using the PDO::PARAM_* constants. To return an INOUT parameter from a stored procedure, use
		the bitwise OR operator to set the PDO::PARAM_INPUT_OUTPUT bits for the $data_type parameter.

	      o $length
		- Length of the data type. To indicate that a parameter is an OUT parameter from a stored procedure, you must explicitly  set  the
		length.

	      o $driver_options
		-

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Execute a prepared statement with named placeholders

	      <?php
	      /* Execute a prepared statement by binding PHP variables */
	      $calories = 150;
	      $colour = 'red';
	      $sth = $dbh->prepare('SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < :calories AND colour = :colour');
	      $sth->bindParam(':calories', $calories, PDO::PARAM_INT);
	      $sth->bindParam(':colour', $colour, PDO::PARAM_STR, 12);
	      $sth->execute();
	      ?>

       Example #2

	      Execute a prepared statement with question mark placeholders

	      <?php
	      /* Execute a prepared statement by binding PHP variables */
	      $calories = 150;
	      $colour = 'red';
	      $sth = $dbh->prepare('SELECT name, colour, calories
		  FROM fruit
		  WHERE calories < ? AND colour = ?');
	      $sth->bindParam(1, $calories, PDO::PARAM_INT);
	      $sth->bindParam(2, $colour, PDO::PARAM_STR, 12);
	      $sth->execute();
	      ?>

       Example #3

	      Call a stored procedure with an INOUT parameter

	      <?php
	      /* Call a stored procedure with an INOUT parameter */
	      $colour = 'red';
	      $sth = $dbh->prepare('CALL puree_fruit(?)');
	      $sth->bindParam(1, $colour, PDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT, 12);
	      $sth->execute();
	      print("After pureeing fruit, the colour is: $colour");
	      ?>

SEE ALSO

       PDO.prepare(3), PDOStatement.execute(3), PDOStatement.bindValue(3).

PHP Documentation Group 												 PDOSTATEMENT.BINDPARAM(3)