Código PHP:
pero no me muestra nada en el navegador Ver original
<?php ?> <html> <head> <title></title> </head> <body> <select name="categoria" id="cat"> <?php $sql_1="SELECT id_concept, desc_concept FROM catalogo WHERE id_cat = 1"; { echo "<option value='".$row_1['id_concept']."' "; if($_POST['categoria']==$r$ow_1['id_concept']) echo " SELECTED "; echo ">"; echo $row_1['desc_concept']; echo "</option>"; } ?> </select> </body> </html>