Echo $var in string result

Hi.

Do you know how can I acomplis this.

I have a String in DB clausula
Entre EL EMPLEADOR, ${empresaNombre}

The I print it

<?php echo $rowModeloContratoClausulas->clausula; But I do not ge to print the varible content, it prints the varible as string: Entre EL EMPLEADOR, ${empresaNombre} Thanks.