function odbc_fetch_array($res) {                     
$row = array(); 
$result = array(); 
if ($result = odbc_fetch_row($res))  { 
$nf = odbc_num_fields($res)+ 1 ;       
for($count= 1 ; $count < $nf; $count++) { 
$field_name = odbc_field_name($res, $count); 
$field_value = odbc_result($res, $count); 
$row[$count] = $field_value; 
 /* or $row[$field_name] =  $field_value */  
} 
return $row;               
} 
} 
 ------------------------ 
 
use it like this : 

$QCateg= "SELECT * FROM Table" ; 
$ret = odbc_exec($conn, $QCateg) or die( "Invalid query : $QCateg" ); 
print  "My select : <select name=myselect>" ; 
While ($row = odbc_fetch_array($ret,  2 )) 
print  "<option value=$row[1 ]>$row[ 2 ]\n"; 
print  "</select>\n
" ;