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# PDOStatement::bindParam

(no version information, might be only in CVS)

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

## Beschreibung

bool PDOStatement::bindParam ( mixed parameter, mixed &variable [, int data_type [, int length]] )

Warnung
Diese Funktion ist EXPERIMENTELL. Das Verhalten, der Funktionsname und alles Andere was hier dokumentiert ist, kann sich in zukünftigen PHP-Versionen ohne Ankündigung ändern. Seien Sie gewarnt und verwenden Sie diese Funktion auf eigenes Risiko.

Binds an SQL statement parameter to the specified variable name. The SQL statement parameter can either be a named placeholder or a question mark placeholder.

Output parameters will set the value of the bound PHP variable to the value returned by the database when the SQL statement is executed. This enables you to call stored procedures with output or input/output parameters, for example, for databases that support such features.

For input-only variables, you can pass an array of input values to PDOStatement::execute() instead.

## Parameter Liste

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.

variable

  Name of the PHP variable to bind to the SQL statement parameter.

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.

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.

## Beispiele

Beispiel 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(); ?>`

Beispiel 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(); ?>`

Beispiel 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"); ?>`

## Siehe auch

PDO::prepare()
PDOStatement::execute()

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