/**
* Returns a series of strings concatinated
*
* concat() accepts an arbitrary number of parameters. Each parameter
* must contain an expression or an array with expressions.
*
* @throws ezcQueryVariableException if no parameters are provided
* @param string|array(string) $... strings that will be concatinated.
* @return string
*/
public function concat()
{
$args = func_get_args();
$cols = ezcQuery::arrayFlatten($args);
if (count($cols) < 1) {
throw new ezcQueryVariableParameterException('concat', count($args), 1);
}
$cols = $this->getIdentifiers($cols);
return join(' || ', $cols);
}
