Updates a row in the table.

Examples:

wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) )
wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )

• wpdb::prepare()
• wpdb::$field_types
• wp_set_wpdb_vars()

$table string Required

Table name.

$data array Required

Data to update (in column => value pairs).
Both $data columns and $data values should be "raw" (neither should be SQL escaped).
Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.

$where array Required

A named array of WHERE clauses (in column => value pairs).
Multiple clauses will be joined with ANDs.
Both $where columns and $where values should be "raw".
Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case.

$format array|string Optional

An array of formats to be mapped to each of the values in $data.
If string, that format will be used for all of the values in $data.
A format is one of '%d', '%f', '%s' (integer, float, string).
If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.

Default: null

$where_format array|string Optional

An array of formats to be mapped to each of the values in $where.
If string, that format will be used for all of the items in $where.
A format is one of '%d', '%f', '%s' (integer, float, string).
If omitted, all values in $where will be treated as strings.

Default: null

int|false The number of rows updated, or false on error.

File: wp-includes/class-wpdb.php. View all references

public function update( $table, $data, $where, $format = null, $where_format = null ) {
	if ( ! is_array( $data ) || ! is_array( $where ) ) {
		return false;
	}

	$data = $this->process_fields( $table, $data, $format );
	if ( false === $data ) {
		return false;
	}
	$where = $this->process_fields( $table, $where, $where_format );
	if ( false === $where ) {
		return false;
	}

	$fields     = array();
	$conditions = array();
	$values     = array();
	foreach ( $data as $field => $value ) {
		if ( is_null( $value['value'] ) ) {
			$fields[] = "`$field` = NULL";
			continue;
		}

		$fields[] = "`$field` = " . $value['format'];
		$values[] = $value['value'];
	}
	foreach ( $where as $field => $value ) {
		if ( is_null( $value['value'] ) ) {
			$conditions[] = "`$field` IS NULL";
			continue;
		}

		$conditions[] = "`$field` = " . $value['format'];
		$values[]     = $value['value'];
	}

	$fields     = implode( ', ', $fields );
	$conditions = implode( ' AND ', $conditions );

	$sql = "UPDATE `$table` SET $fields WHERE $conditions";

	$this->check_current_query = false;
	return $this->query( $this->prepare( $sql, $values ) );
}