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Database abstraction layer

Allow the use of different database servers using the same code base.

Code

includes/database/select.inc, line 1143

<?php
public function __clone() {
  // On cloning, also clone the conditional objects. However, we do not
  // want to clone the database connection object as that would duplicate the
  // connection itself.

  $this->where = clone($this->where);
  $this->having = clone($this->having);
}
?>