Echo selected value first - php

Question

I need to echo the selected value first in a form when user wants to make an update. I tried several variants:
1)
<?php
$opt= array('1' => 'opt1', '2' => 'opt2', '3' => 'opt3') ;
echo '<select name="up_opt" >' ;
foreach ($opt as $i => $value) {
echo "<option value=\"$i\"";
if ($_REQUEST['up_opt'] == $i)
{
echo "selected" ;
}
echo ">$opt[$i]</option>" ;
}
echo '</select>' ;
?>
2)
<?php $opt= array('1' => 'opt1', '2' => 'opt2', '3' => 'opt3') ;
$edu = $_REQUEST['edu'];
<select name="up_opt">
<?php foreach ( $opt as $i=>$opt ) : ?>
<option value="<?php echo $i?>" <?php echo $i == $edu ? 'selected' : ''?>><?php echo $opt ?></option>
<?php endforeach; ?>
</select>
3)
<select name="up_opt">
<option value="1" <?php if ($_GET['1'] == 'option1') { echo 'selected'; } ?>>Opt1</option>
<option value="2" <?php if ($_GET['2'] == 'option2') { echo 'selected'; } ?>>Opt2</option>
<option value="3" <?php if ($_GET['3'] == 'option3') { echo 'selected'; } ?>>Opt3</option>
</select>
None of these variants echoes the checked value first. Can someone help me, tell me what is wrong or give me another variant?

Answer 1

Variant 3 is ok (but I'd rather use a loop instead of hard-coded options). Your mistake is that you compare 'option1', 'option2' and so one when your real values are '1', '2', '3'. Also as #ElefantPhace said, don't forget about spaces before selected, or you'll get invalid html instead. So it would be this:
<select name="up_opt">
<option value="1" <?php if ($_GET['up_opt'] == 1) { echo ' selected="selected"'; } ?>>Opt1</option>
<option value="2" <?php if ($_GET['up_opt'] == 2) { echo ' selected="selected"'; } ?>>Opt2</option>
<option value="3" <?php if ($_GET['up_opt'] == 3) { echo ' selected="selected"'; } ?>>Opt3</option>
</select>
With loop:
<?php
$options = array(
1 => 'Opt1',
2 => 'Opt2',
3 => 'Opt3',
);
?>
<select name="up_opt">
<?php foreach ($options as $value => $label): ?>
<option value="<?php echo $value; ?>" <?php if ($_GET['up_opt'] == 1) { echo ' selected="selected"'; } ?>><?php echo $label; ?></option>
<?php endforeach ?>
</select>

Answer 2

Here is all three of your variants, tested and working as expected. They are all basically the same, you were just using the wrong variable names, and different ones from example to example
1)
<?php
$opt= array('1' => 'opt1', '2' => 'opt2', '3' => 'opt3') ;
echo '<select name="up_opt">';
foreach ($opt as $i => $value) {
echo "<option value=\"$i\"";
if ($_POST['up_opt'] == $i){
echo " selected";
}
echo ">$value</option>";
}
echo '</select>';
?>
2) uses same array as above
$edu = $_POST['up_opt'];
echo '<select name="up_opt">';
foreach ( $opt as $i => $value ){
echo "<option value=\"$i\"", ($i == $edu) ? ' selected' : '';
echo ">$value</option>";
}
echo "</select>";
3)
echo '<select name="up_opt">';
echo '<option value="1"', ($_POST['up_opt'] == '1') ? 'selected':'' ,'>Opt1</option>';
echo '<option value="2"', ($_POST['up_opt'] == '2') ? 'selected':'' ,'>Opt2</option>';
echo '<option value="3"', ($_POST['up_opt'] == '3') ? 'selected':'' ,'>Opt3</option>';
echo '</select>';