cakephp / phinx

     * @param array $options Options

     * @return \Phinx\Db\Table

     */

    public function addForeignKey($columns, $referencedTable, $referencedColumns = ['id'], $options = [])

    {

        $action = AddForeignKey::build($this->table, $columns, $referencedTable, $referencedColumns);

        $this->actions->addAction($action);

        return $this;

    }

    /**

     * Add a foreign key to a database table with a given name.

     * @param array $options Options

     * @return \Phinx\Db\Table

     */

    public function addForeignKeyWithName($name, $columns, $referencedTable, $referencedColumns = ['id'], $options = [])

    {

        $action = AddForeignKey::build(

            $this->table,

            $columns,

            $referencedTable,

            $referencedColumns,

            $options,

            $name

        );

        $this->actions->addAction($action);

        return $this;

    }

    /**

     * Removes the given foreign key from the table.

     * @param null|string  $constraint Constraint names

     * @return \Phinx\Db\Table

     */

    public function dropForeignKey($columns, $constraint = null)

    {

        $action = DropForeignKey::build($this->table, $columns, $constraint);

        $this->actions->addAction($action);

        return $this;

    }

    /**

     * Checks to see if a foreign key exists.