The problem is here
echo "
<FORM NAME = \"AccessInterface\" METHOD=post ACTION=\"DataAccess.php3\">
Por favor insira os seus dados para o Workload<br> <br>
First Name:<input name=\"FirstName\" TYPE=\"text\" SIZE=\"25\"><br>
Teste:<input name=\"Teste\" TYPE=\"checkbox\" value=\"re\">re<br>
Teste de Seleção:
<select name=\"teste\">
<php?
ABRE_CL();
?>
You are already in php remove the <php? add a ". and it should work.
e.g.
<select name=\"teste\">". ABRE_CL();
HalfaBee