恢复价值一段时间

I create this code to display a list of countries, I would retrieve the selected country but it does not work

<?php
include 'includes/combo.php';
?>

<?php
echo "<label for='pays'>Pays*</label>
        <select id='pays' name='pays '>";

while ($row = mysql_fetch_array($combo)) {
    echo "<option>$row[0]</option>";
}
echo "</select> ";
echo "<option>$row[0]</option>";
?>

and recover with a

if(isset($_POST['pays']))      
    $pays=$_POST['pays'];
else
  $pays="";

echo $pays;

but the pays value is not recouped

echo"<option value=" . $row[0] . ">$row[0]</option>";

To retrieve the value of your option

Try this

<?php
include 'includes/combo.php';
?>

<?php
echo '<label for="pays">Pays*</label>
       <select id="pays" name="pays">';

while ($row = mysql_fetch_array($combo)) {
    echo '<option value="' . $row[0] . '">' . $row[0] . '</option>';
}

echo '</select>';
?>

You have one space after name in select And your option hasn't value attribut